cbfstool: fix implicit declaration of strcasecmp

Change-Id: Iefeb47bca3676a1f807b7a66b74a07491e351362
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/27632
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed