Make libgcc wrappers arch-specific, add ARMv7

Change-Id: Ia0bbd3bec6588219ce24951c0bcebefc6b6ec80e
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/1940
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
1 file changed