syscall: add S_IRWXG and S_IRWXO to FreeBSD types

Companion PR to https://github.com/golang/sys/pull/13

Change-Id: I097fc97912840eb69ca232eded6ba939de0fead9
GitHub-Last-Rev: f8a8f7d96c96e3cb03010cb3d9607741f4bbc3a1
GitHub-Pull-Request: golang/go#26675
Reviewed-on: https://go-review.googlesource.com/126621
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/syscall/types_freebsd.go

@@ -198,6 +198,8 @@ const ( // Directory mode bits
 	S_IRUSR  = C.S_IRUSR
 	S_IWUSR  = C.S_IWUSR
 	S_IXUSR  = C.S_IXUSR
+	S_IRWXG  = C.S_IRWXG
+	S_IRWXO  = C.S_IRWXO
 )
 
 type Stat_t C.struct_stat8

src/syscall/ztypes_freebsd_386.go

@@ -71,6 +71,8 @@ const (
 	S_IRUSR  = 0x100
 	S_IWUSR  = 0x80
 	S_IXUSR  = 0x40
+	S_IRWXG  = 0x38
+	S_IRWXO  = 0x7
 )
 
 type Stat_t struct {

src/syscall/ztypes_freebsd_amd64.go

@@ -71,6 +71,8 @@ const (
 	S_IRUSR  = 0x100
 	S_IWUSR  = 0x80
 	S_IXUSR  = 0x40
+	S_IRWXG  = 0x38
+	S_IRWXO  = 0x7
 )
 
 type Stat_t struct {

src/syscall/ztypes_freebsd_arm.go

@@ -73,6 +73,8 @@ const (
 	S_IRUSR  = 0x100
 	S_IWUSR  = 0x80
 	S_IXUSR  = 0x40
+	S_IRWXG  = 0x38
+	S_IRWXO  = 0x7
 )
 
 type Stat_t struct {