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>
1 file changed