internal/socket: remove unused sizeofMmsghdr const

Change-Id: I6f66e2fd93916438ad959de469ee081b7085fe1a
Reviewed-on: https://go-review.googlesource.com/c/net/+/195597
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/internal/socket/defs_aix.go b/internal/socket/defs_aix.go
index c9d05b2..ae1b21c 100644
--- a/internal/socket/defs_aix.go
+++ b/internal/socket/defs_aix.go
@@ -31,7 +31,6 @@
 const (
 	sizeofIovec   = C.sizeof_struct_iovec
 	sizeofMsghdr  = C.sizeof_struct_msghdr
-	sizeofMmsghdr = C.sizeof_struct_mmsghdr
 	sizeofCmsghdr = C.sizeof_struct_cmsghdr
 
 	sizeofSockaddrInet  = C.sizeof_struct_sockaddr_in
diff --git a/internal/socket/defs_linux.go b/internal/socket/defs_linux.go
index 6c5c11d..85bb745 100644
--- a/internal/socket/defs_linux.go
+++ b/internal/socket/defs_linux.go
@@ -33,7 +33,6 @@
 const (
 	sizeofIovec   = C.sizeof_struct_iovec
 	sizeofMsghdr  = C.sizeof_struct_msghdr
-	sizeofMmsghdr = C.sizeof_struct_mmsghdr
 	sizeofCmsghdr = C.sizeof_struct_cmsghdr
 
 	sizeofSockaddrInet  = C.sizeof_struct_sockaddr_in
diff --git a/internal/socket/defs_netbsd.go b/internal/socket/defs_netbsd.go
index 3d3b776..5bfdd46 100644
--- a/internal/socket/defs_netbsd.go
+++ b/internal/socket/defs_netbsd.go
@@ -31,7 +31,6 @@
 const (
 	sizeofIovec   = C.sizeof_struct_iovec
 	sizeofMsghdr  = C.sizeof_struct_msghdr
-	sizeofMmsghdr = C.sizeof_struct_mmsghdr
 	sizeofCmsghdr = C.sizeof_struct_cmsghdr
 
 	sizeofSockaddrInet  = C.sizeof_struct_sockaddr_in
diff --git a/internal/socket/zsys_aix_ppc64.go b/internal/socket/zsys_aix_ppc64.go
index 813385a..e740c8f 100644
--- a/internal/socket/zsys_aix_ppc64.go
+++ b/internal/socket/zsys_aix_ppc64.go
@@ -53,7 +53,6 @@
 const (
 	sizeofIovec   = 0x10
 	sizeofMsghdr  = 0x30
-	sizeofMmsghdr = 0x38
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_386.go b/internal/socket/zsys_linux_386.go
index 72d8b25..d33025b 100644
--- a/internal/socket/zsys_linux_386.go
+++ b/internal/socket/zsys_linux_386.go
@@ -47,7 +47,6 @@
 const (
 	sizeofIovec   = 0x8
 	sizeofMsghdr  = 0x1c
-	sizeofMmsghdr = 0x20
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_amd64.go b/internal/socket/zsys_linux_amd64.go
index 3545319..b20d216 100644
--- a/internal/socket/zsys_linux_amd64.go
+++ b/internal/socket/zsys_linux_amd64.go
@@ -50,7 +50,6 @@
 const (
 	sizeofIovec   = 0x10
 	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_arm.go b/internal/socket/zsys_linux_arm.go
index 72d8b25..1bb10a4 100644
--- a/internal/socket/zsys_linux_arm.go
+++ b/internal/socket/zsys_linux_arm.go
@@ -45,9 +45,9 @@
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofMmsghdr = 0x20
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
+
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_arm64.go b/internal/socket/zsys_linux_arm64.go
index 3545319..7f6e8a7 100644
--- a/internal/socket/zsys_linux_arm64.go
+++ b/internal/socket/zsys_linux_arm64.go
@@ -48,9 +48,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_mips.go b/internal/socket/zsys_linux_mips.go
index 72d8b25..1bb10a4 100644
--- a/internal/socket/zsys_linux_mips.go
+++ b/internal/socket/zsys_linux_mips.go
@@ -45,9 +45,9 @@
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofMmsghdr = 0x20
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
+
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_mips64.go b/internal/socket/zsys_linux_mips64.go
index 3545319..7f6e8a7 100644
--- a/internal/socket/zsys_linux_mips64.go
+++ b/internal/socket/zsys_linux_mips64.go
@@ -48,9 +48,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_mips64le.go b/internal/socket/zsys_linux_mips64le.go
index 3545319..7f6e8a7 100644
--- a/internal/socket/zsys_linux_mips64le.go
+++ b/internal/socket/zsys_linux_mips64le.go
@@ -48,9 +48,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_mipsle.go b/internal/socket/zsys_linux_mipsle.go
index 72d8b25..1bb10a4 100644
--- a/internal/socket/zsys_linux_mipsle.go
+++ b/internal/socket/zsys_linux_mipsle.go
@@ -45,9 +45,9 @@
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofMmsghdr = 0x20
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
+
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_ppc64.go b/internal/socket/zsys_linux_ppc64.go
index 3545319..7f6e8a7 100644
--- a/internal/socket/zsys_linux_ppc64.go
+++ b/internal/socket/zsys_linux_ppc64.go
@@ -48,9 +48,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_ppc64le.go b/internal/socket/zsys_linux_ppc64le.go
index 3545319..7f6e8a7 100644
--- a/internal/socket/zsys_linux_ppc64le.go
+++ b/internal/socket/zsys_linux_ppc64le.go
@@ -48,9 +48,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_riscv64.go b/internal/socket/zsys_linux_riscv64.go
index dbff234..f12a1d7 100644
--- a/internal/socket/zsys_linux_riscv64.go
+++ b/internal/socket/zsys_linux_riscv64.go
@@ -49,9 +49,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_linux_s390x.go b/internal/socket/zsys_linux_s390x.go
index 3545319..7f6e8a7 100644
--- a/internal/socket/zsys_linux_s390x.go
+++ b/internal/socket/zsys_linux_s390x.go
@@ -48,9 +48,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
+
 	sizeofCmsghdr = 0x10
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_netbsd_386.go b/internal/socket/zsys_netbsd_386.go
index bf8f47c..7e258ce 100644
--- a/internal/socket/zsys_netbsd_386.go
+++ b/internal/socket/zsys_netbsd_386.go
@@ -47,9 +47,9 @@
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofMmsghdr = 0x20
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
+
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_netbsd_amd64.go b/internal/socket/zsys_netbsd_amd64.go
index a46eff9..b3f9c0d 100644
--- a/internal/socket/zsys_netbsd_amd64.go
+++ b/internal/socket/zsys_netbsd_amd64.go
@@ -50,9 +50,9 @@
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofMmsghdr = 0x40
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
+
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_netbsd_arm.go b/internal/socket/zsys_netbsd_arm.go
index bf8f47c..7e258ce 100644
--- a/internal/socket/zsys_netbsd_arm.go
+++ b/internal/socket/zsys_netbsd_arm.go
@@ -47,9 +47,9 @@
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofMmsghdr = 0x20
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
+
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10
diff --git a/internal/socket/zsys_netbsd_arm64.go b/internal/socket/zsys_netbsd_arm64.go
index a46eff9..da26ef0 100644
--- a/internal/socket/zsys_netbsd_arm64.go
+++ b/internal/socket/zsys_netbsd_arm64.go
@@ -52,7 +52,6 @@
 const (
 	sizeofIovec   = 0x10
 	sizeofMsghdr  = 0x30
-	sizeofMmsghdr = 0x40
 	sizeofCmsghdr = 0xc
 
 	sizeofSockaddrInet  = 0x10