unix: add CRTSCTS on netbsd and openbsd

Fixes golang/go#8760

Change-Id: Iacb5802ce6256fc5fb61b558f2d0bc0dcf593c96
Reviewed-on: https://go-review.googlesource.com/103355
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/zerrors_netbsd_386.go

@@ -159,6 +159,7 @@ const (
 	CLONE_VFORK                       = 0x4000
 	CLONE_VM                          = 0x100
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x10000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200

unix/zerrors_netbsd_amd64.go

@@ -159,6 +159,7 @@ const (
 	CLONE_VFORK                       = 0x4000
 	CLONE_VM                          = 0x100
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x10000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200

unix/zerrors_netbsd_arm.go

@@ -151,6 +151,7 @@ const (
 	CFLUSH                            = 0xf
 	CLOCAL                            = 0x8000
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x10000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200

unix/zerrors_openbsd_386.go

@@ -147,6 +147,7 @@ const (
 	CFLUSH                            = 0xf
 	CLOCAL                            = 0x8000
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x10000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200

unix/zerrors_openbsd_amd64.go

@@ -147,6 +147,7 @@ const (
 	CFLUSH                            = 0xf
 	CLOCAL                            = 0x8000
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x10000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200

unix/zerrors_openbsd_arm.go

@@ -147,6 +147,7 @@ const (
 	CFLUSH                            = 0xf
 	CLOCAL                            = 0x8000
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x10000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200