Update Buck to newest version

The latest Buck version added support to long awaited feature: ability
to specify "..." syntax used for target visibility to target selection
from the command line: [1], e.g.:

  $ buck build gerrit-server/...
  $ buck test gerrit-server/...

[1] https://github.com/facebook/buck/issues/294

Change-Id: I7ce804b1c86fa483fbfe0b50b86892ae9e5e4c7a
1 file changed