login_manager: symlink common.mk to the main one

No need to manually copy it anymore.

BUG=None
TEST=`emerge-x86-alex chromeos-login` still works

Change-Id: I582f98356e9ef7295cad9fba33b6d791b1274d91
Reviewed-on: https://chromium-review.googlesource.com/202922
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Queue: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
2 files changed