use CPPFLAGS for -I/-D flags

The right place for these is CPPFLAGS, so that instead.

BUG=None
TEST=`cbuildbot {amd64,arm,x86}-generic-full lumpy-release` works

Change-Id: Ia7bf1c027e3dd080c043cad48bad35266e613cb1
Reviewed-on: https://chromium-review.googlesource.com/168200
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed