Update ninja to v120715

Update ninja to v120715

On both mac and linux, I ran:

git checkout release-120715
ninja
./ninja ninja_test
./ninja_test  # all passed
strip ninja

Changes since the last push:
* ninja now has a functional -V flag that prints version information
* ninja is a lot faster. On my MBP, empty builds go from 1.8s to 1.1s,
  on my linux box from 1.4s to 0.9s
* ninja now has a -l N flag to do parallelsim based on load average

On linux, the binary grew 24 bytes, from 129920 to 129944. I used
gcc 4.4.3 to build ninja.

On mac, it grew from 4200 byte from 120904 to 125104 (likely caused by me
using a newer clang). I used clang r159409 to build ninja.

TBR=maruel@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=147557

[scottmg, 2012-07-19 22:32:12]

lgtm

[commit-bot: I haz the power, 2012-07-19 22:37:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/10810025/8001

[commit-bot: I haz the power, 2012-07-19 22:40:03]

Presubmit check for 10810025-8001 failed and returned exit status 1.

Running presubmit commit checks ...
Checking out rietveld...
Running save-description-on-failure.sh
Running push-basic.sh
Running upstream.sh
Running submit-from-new-dir.sh
Running abandon.sh
Running submodule-merge-test.sh
Running upload-local-tracking-branch.sh
Running hooks.sh
Running post-dcommit-hook-test.sh
Running upload-stale.sh
Running patch.sh
Running basic.sh

** Presubmit ERRORS **
Missing LGTM from an OWNER for files in these directories:
    depot_tools

Presubmit checks took 145.3s to calculate.

Was the presubmit check useful? Please send feedback & hate mail to
maruel@chromium.org!

[commit-bot: I haz the power, 2012-07-19 22:43:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/10810025/8001

[commit-bot: I haz the power, 2012-07-19 22:46:21]

Change committed as 147557