mac ninja&make: Use xcrun instead of xcodebuild where possible.

mac ninja&make: Use xcrun instead of xcodebuild where possible.

We used to not use xcrun because it used to not exist long ago.  Nowadays,
xcrun should be present everywhere (Xcode 5+ I think) and it's much faster.
Running `python gyptest.py -a -f ninja` on my laptop takes 5 minutes without
this patch and 3m20s with it.

No intended behavior change.

BUG=none
R=mark@chromium.org

Committed: https://chromium.googlesource.com/external/gyp/+/54b7dfc03f746b6a539ac38f2fb0815d10b54734

[Nico, 2015-12-13 04:09:10]

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

[Nico, 2015-12-13 04:09:11]

Justin: This should work on iOS too, right?

[Mark Mentovai, 2015-12-13 15:23:22]

LGTM

[justincohen, 2015-12-14 07:14:11]

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

[justincohen, 2015-12-14 07:14:11]

Yup, xcrun should be fine on iOS.

[Nico, 2016-01-14 17:26:03]

Description was changed from

==========
mac ninja&make: Use xcrun instead of xcodebuild where possible.

We used to not use xcrun because it used to not exist long ago.  Nowadays,
xcrun should be present everywhere (Xcode 5+ I think) and it's much faster.
Running `python gyptest.py -a -f ninja` on my laptop takes 5 minutes without
this patch and 3m20s with it.

No intended behavior change.

BUG=none
==========

to

==========
mac ninja&make: Use xcrun instead of xcodebuild where possible.

We used to not use xcrun because it used to not exist long ago.  Nowadays,
xcrun should be present everywhere (Xcode 5+ I think) and it's much faster.
Running `python gyptest.py -a -f ninja` on my laptop takes 5 minutes without
this patch and 3m20s with it.

No intended behavior change.

BUG=none
R=mark@chromium.org

Committed:
https://chromium.googlesource.com/external/gyp/+/54b7dfc03f746b6a539ac38f2fb0...
==========

[Nico, 2016-01-14 17:26:04]

Committed patchset #1 (id:1) manually as
54b7dfc03f746b6a539ac38f2fb0815d10b54734 (presubmit successful).