Adds a few clang flags to mosys meson.build file

Adds the clang flags -Wall -Werror -Wundef -Wstrict-prototypes to the
meson.build file for Mosys, which will enable more strict compile-time
checks for C code.

BUG=chromium:876106
TEST=emerge-coral sys-apps/mosys

Change-Id: I4b1d12f1c4e0a091c104d95f72e30652a696520a
Reviewed-on: https://chromium-review.googlesource.com/1185781
Commit-Ready: Jason Clinton <jclinton@chromium.org>
Tested-by: Alec Thilenius <athilenius@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed