New binaries for Mac, Linux32, Linux64, Windows.  Also update shell script.
See the bug for how these were built.
The main "new" thing is performance improvement when building chrome with goma.

After confirming the the behavior of ninja 1.8.0 on buildbot, I will roll ninja 1.8.1 includes fix for non-deterministic test.

TBR=dpranke@chromium.org
Bug: 761691, 738186
Change-Id: I108996dccfdf5d95d8815d6cece5eba46f3e8178
Reviewed-on: https://chromium-review.googlesource.com/648372
Commit-Queue: Takuto Ikuta <tikuta@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>