mmc-utils: update to _FORTIFY_SOURCE=3

Since this project explicitly specifies its FORTIFY level, update it to
the level CrOS wants to move to.

BUG=b:288411201
TEST=CQ+1

Change-Id: Icba3f1175f3c6bc3d4315e55c012131bbf5037cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mmc-utils/+/4707933
Tested-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Sarthak Kukreti <sarthakkukreti@google.com>
Commit-Queue: George Burgess <gbiv@chromium.org>
1 file changed