Fix ninja wrapper to work on MINGW64

Fix ninja wrapper to work on MINGW64

Small fix that makes it possible to use ninja and depot-tools using
the mingw64 chroot bundled in git 2.7.0
With this change I can build succesfully on Windows and still have
a civilized shell.

BUG=
TBR=maruel@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298454

[Primiano Tucci (use gerrit), 2016-01-28 19:51:11]

primiano@chromium.org changed reviewers:
+ maruel@chromium.org

[Nico, 2016-01-28 19:52:34]

thakis@chromium.org changed reviewers:
+ thakis@chromium.org

[Nico, 2016-01-28 19:52:34]

lgtm

[Primiano Tucci (use gerrit), 2016-01-28 19:54:41]

Description was changed from

==========
Fix ninja wrapper to work on MINGW64

Small fix that makes it possible to use ninja and depot-tools using
the mingw64 chroot bundled in git 2.7.0
With this change I can build succesfully on Windows and still have
a civilized shell.

BUG=
==========

to

==========
Fix ninja wrapper to work on MINGW64

Small fix that makes it possible to use ninja and depot-tools using
the mingw64 chroot bundled in git 2.7.0
With this change I can build succesfully on Windows and still have
a civilized shell.

BUG=
TBR=maruel@chromium.org
==========

[Primiano Tucci (use gerrit), 2016-01-28 19:54:44]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2016-01-28 19:54:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1638303006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1638303006/1

[commit-bot: I haz the power, 2016-01-28 19:56:39]

Description was changed from

==========
Fix ninja wrapper to work on MINGW64

Small fix that makes it possible to use ninja and depot-tools using
the mingw64 chroot bundled in git 2.7.0
With this change I can build succesfully on Windows and still have
a civilized shell.

BUG=
TBR=maruel@chromium.org
==========

to

==========
Fix ninja wrapper to work on MINGW64

Small fix that makes it possible to use ninja and depot-tools using
the mingw64 chroot bundled in git 2.7.0
With this change I can build succesfully on Windows and still have
a civilized shell.

BUG=
TBR=maruel@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298454
==========

[commit-bot: I haz the power, 2016-01-28 19:56:40]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=298454