Created by: davido
Fixes: https://github.com/facebook/buck/issues/604
Test plan:
Build Gerrit Code Review and observe, that No-op build doesn't take > 5 seconds:
$ time buck build //gerrit-gwtui:ui_safari [-] PROCESSING BUCK FILES...FINISHED 0.0s [-] BUILDING...FINISHED 0.1s 100% real 0m1.443s user 0m1.207s sys 0m0.105s