Revert "aclocal.m4: Use Werror in PA_CHECK_FALLTHROUGH_ATTRIBUTE"
Revert "aclocal.m4: Use Werror in PA_CHECK_FALLTHROUGH_ATTRIBUTE"

This reverts commit 8b211a0a3b87999ffe38d03ba1e01639bfc05db0.

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm