unix: regenerate for macOS 10.13/iOS 11.1

Update the syscall numbers and error constants on macOS 10.13 with iOS
SDK 11.1.

The removed syscalls are all removed or marked as deprecated/old in the
following list

  https://opensource.apple.com/source/xnu/xnu-4570.1.46/bsd/kern/syscalls.master

which according to

  https://opensource.apple.com/release/macos-1013.html

is the kernel version used for macOS 10.13.

The poll function was moved around because I missed to regenerate the
zsyscall_darwin_*.go files in CL 74290.

Change-Id: I747c8c842f78f3db8d25b46759265aa99da9d739
Reviewed-on: https://go-review.googlesource.com/75972
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/unix/zerrors_darwin_arm64.go b/unix/zerrors_darwin_arm64.go
index 4c2e696..73f8c87 100644
--- a/unix/zerrors_darwin_arm64.go
+++ b/unix/zerrors_darwin_arm64.go
@@ -510,6 +510,7 @@
 	F_PATHPKG_CHECK                   = 0x34
 	F_PEOFPOSMODE                     = 0x3
 	F_PREALLOCATE                     = 0x2a
+	F_PUNCHHOLE                       = 0x63
 	F_RDADVISE                        = 0x2c
 	F_RDAHEAD                         = 0x2d
 	F_RDLCK                           = 0x1
@@ -526,6 +527,7 @@
 	F_SINGLE_WRITER                   = 0x4c
 	F_THAW_FS                         = 0x36
 	F_TRANSCODEKEY                    = 0x4b
+	F_TRIM_ACTIVE_FILE                = 0x64
 	F_UNLCK                           = 0x2
 	F_VOLPOSMODE                      = 0x4
 	F_WRLCK                           = 0x3
@@ -766,6 +768,7 @@
 	IPV6_FAITH                        = 0x1d
 	IPV6_FLOWINFO_MASK                = 0xffffff0f
 	IPV6_FLOWLABEL_MASK               = 0xffff0f00
+	IPV6_FLOW_ECN_MASK                = 0x300
 	IPV6_FRAGTTL                      = 0x3c
 	IPV6_FW_ADD                       = 0x1e
 	IPV6_FW_DEL                       = 0x1f
@@ -856,6 +859,7 @@
 	IP_RECVOPTS                       = 0x5
 	IP_RECVPKTINFO                    = 0x1a
 	IP_RECVRETOPTS                    = 0x6
+	IP_RECVTOS                        = 0x1b
 	IP_RECVTTL                        = 0x18
 	IP_RETOPTS                        = 0x8
 	IP_RF                             = 0x8000