unix: update FreeBSD generated types and errors

Update the generated types and errors for FreeBSD by running mkall.sh
and ensuring no values where removed.

Change-Id: I5b82b1896b64f1b33d569dcaa477bb88641dfa8d
Reviewed-on: https://go-review.googlesource.com/15011
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/unix/ztypes_freebsd_amd64.go b/unix/ztypes_freebsd_amd64.go
index 9339592..e5feb20 100644
--- a/unix/ztypes_freebsd_amd64.go
+++ b/unix/ztypes_freebsd_amd64.go
@@ -1,8 +1,7 @@
+// +build amd64,freebsd
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_freebsd.go
 
-// +build amd64,freebsd
-
 package unix
 
 const (
@@ -140,6 +139,15 @@
 	Val [2]int32
 }
 
+const (
+	FADV_NORMAL     = 0x0
+	FADV_RANDOM     = 0x1
+	FADV_SEQUENTIAL = 0x2
+	FADV_WILLNEED   = 0x3
+	FADV_DONTNEED   = 0x4
+	FADV_NOREUSE    = 0x5
+)
+
 type RawSockaddrInet4 struct {
 	Len    uint8
 	Family uint8