fix object handling

We have to use the builtin OBJECTS from common.mk to build out of
tree properly.

BUG=chromium:401876
TEST=`FEATURES=test emerge-link audiotest` still works

Change-Id: Ic11f082b548d6b96c0e841f55fc66409d8073bbf
Reviewed-on: https://chromium-review.googlesource.com/216863
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed