buildgcc: Fail if a patch failed to apply

Otherwise one could end up with what they think is a coreboot toolchain
but in fact it'd be missing some patches.

Change-Id: Ic451f7061b822d0f4b64acc9976ba81fd544e85b
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10487
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>

util/crossgcc/buildgcc

@@ -226,8 +226,10 @@ unpack_and_patch() {
 		for patch in patches/${dir}_*.patch; do
 			test -r $patch || continue
 			printf "   o $(basename $patch)\n"
-			$PATCH -s -N -p0 < $(echo $patch) || \
+			$PATCH -s -N -p0 < $(echo $patch) || {
 				printf "\n${RED}Failed $patch.${NC}\n"
+				exit 1
+			}
 		done
 		touch ${dir}/.unpack_success
 	)