Mask C and C++ files.

These files are only required at build time.

BUG=chromium:417132
TEST=`./build_image` doesn't have these files.

Change-Id: I8fc91686b64571566e743eb5767c1b8ba007e6b1
Reviewed-on: https://chromium-review.googlesource.com/219683
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
1 file changed