leveldb: Add correct CFLAGS

leveldb does not respect custom's CFLAGS.
This CL fix this.

BUG=None
TEST=The CFLAGS is added.

Change-Id: I7ce1c49d757899723811740cc8713ad57f4127f9
Reviewed-on: https://chromium-review.googlesource.com/179378
Reviewed-by: Han Shen <shenhan@google.com>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
1 file changed