unix: add MNT_* constants on Darwin

Add the MNT_* constants used for the Mount and Umount functions on
Darwin.

Generated on Mac OS 10.11 (Darwin 15.6.0). This also brings
zerrors_darwin_{arm,arm64} up to date with constants which are already
present for 386 and amd64.

Fixes golang/go#9891

Change-Id: Id77847a2fb805a759aa0f5b36e8954b764e699a5
Reviewed-on: https://go-review.googlesource.com/54210Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/mkerrors.sh

@@ -45,6 +45,7 @@ includes_Darwin='
 #include <sys/sockio.h>
 #include <sys/sysctl.h>
 #include <sys/mman.h>
+#include <sys/mount.h>
 #include <sys/wait.h>
 #include <net/bpf.h>
 #include <net/if.h>

unix/zerrors_darwin_386.go

@@ -822,6 +822,38 @@ const (
 	MAP_SHARED                        = 0x1
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2
+	MNT_ASYNC                         = 0x40
+	MNT_AUTOMOUNTED                   = 0x400000
+	MNT_CMDFLAGS                      = 0xf0000
+	MNT_CPROTECT                      = 0x80
+	MNT_DEFWRITE                      = 0x2000000
+	MNT_DONTBROWSE                    = 0x100000
+	MNT_DOVOLFS                       = 0x8000
+	MNT_DWAIT                         = 0x4
+	MNT_EXPORTED                      = 0x100
+	MNT_FORCE                         = 0x80000
+	MNT_IGNORE_OWNERSHIP              = 0x200000
+	MNT_JOURNALED                     = 0x800000
+	MNT_LOCAL                         = 0x1000
+	MNT_MULTILABEL                    = 0x4000000
+	MNT_NOATIME                       = 0x10000000
+	MNT_NOBLOCK                       = 0x20000
+	MNT_NODEV                         = 0x10
+	MNT_NOEXEC                        = 0x4
+	MNT_NOSUID                        = 0x8
+	MNT_NOUSERXATTR                   = 0x1000000
+	MNT_NOWAIT                        = 0x2
+	MNT_QUARANTINE                    = 0x400
+	MNT_QUOTA                         = 0x2000
+	MNT_RDONLY                        = 0x1
+	MNT_RELOAD                        = 0x40000
+	MNT_ROOTFS                        = 0x4000
+	MNT_SYNCHRONOUS                   = 0x2
+	MNT_UNION                         = 0x20
+	MNT_UNKNOWNPERMISSIONS            = 0x200000
+	MNT_UPDATE                        = 0x10000
+	MNT_VISFLAGMASK                   = 0x17f0f5ff
+	MNT_WAIT                          = 0x1
 	MSG_CTRUNC                        = 0x20
 	MSG_DONTROUTE                     = 0x4
 	MSG_DONTWAIT                      = 0x80

unix/zerrors_darwin_amd64.go

@@ -822,6 +822,38 @@ const (
 	MAP_SHARED                        = 0x1
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2
+	MNT_ASYNC                         = 0x40
+	MNT_AUTOMOUNTED                   = 0x400000
+	MNT_CMDFLAGS                      = 0xf0000
+	MNT_CPROTECT                      = 0x80
+	MNT_DEFWRITE                      = 0x2000000
+	MNT_DONTBROWSE                    = 0x100000
+	MNT_DOVOLFS                       = 0x8000
+	MNT_DWAIT                         = 0x4
+	MNT_EXPORTED                      = 0x100
+	MNT_FORCE                         = 0x80000
+	MNT_IGNORE_OWNERSHIP              = 0x200000
+	MNT_JOURNALED                     = 0x800000
+	MNT_LOCAL                         = 0x1000
+	MNT_MULTILABEL                    = 0x4000000
+	MNT_NOATIME                       = 0x10000000
+	MNT_NOBLOCK                       = 0x20000
+	MNT_NODEV                         = 0x10
+	MNT_NOEXEC                        = 0x4
+	MNT_NOSUID                        = 0x8
+	MNT_NOUSERXATTR                   = 0x1000000
+	MNT_NOWAIT                        = 0x2
+	MNT_QUARANTINE                    = 0x400
+	MNT_QUOTA                         = 0x2000
+	MNT_RDONLY                        = 0x1
+	MNT_RELOAD                        = 0x40000
+	MNT_ROOTFS                        = 0x4000
+	MNT_SYNCHRONOUS                   = 0x2
+	MNT_UNION                         = 0x20
+	MNT_UNKNOWNPERMISSIONS            = 0x200000
+	MNT_UPDATE                        = 0x10000
+	MNT_VISFLAGMASK                   = 0x17f0f5ff
+	MNT_WAIT                          = 0x1
 	MSG_CTRUNC                        = 0x20
 	MSG_DONTROUTE                     = 0x4
 	MSG_DONTWAIT                      = 0x80