buildgcc: OpenBSD's tar and patch are sufficient, too

No need to enforce GNU versions for them.

Change-Id: Ieeb43298331fbefbcc1e230d41a90e9df56993eb
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/10017
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index 5a15e6d..ae581b9 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -117,7 +117,7 @@
 	done
 	# A workaround for OSX 10.9 and some BSDs, whose nongnu
 	# patch and tar also work.
-	if [ $UNAME = "Darwin" -o $UNAME = "FreeBSD" -o $UNAME = "NetBSD" ]; then
+	if [ $UNAME = "Darwin" -o $UNAME = "FreeBSD" -o $UNAME = "NetBSD" -o $UNAME = "OpenBSD" ]; then
 		if [ "$1" = "patch" -o "$1" = "tar" ]; then
 			if test -x "`which $1 2>/dev/null`"; then
 				echo $1