roll gyp 1682:1693

roll gyp 1682:1693

The big change is initial support for ARCHS / fat binaries with ninja on mac.

1683: On Windows, don't try to create relative paths across different drives
1684: Fix typo in r1683.
1685: ninja/mac: GCC_C_LANGUAGE_STANDARD ansi is -ansi, not -std=ansi
1686: ninja/mac: Simplify slightly, no behavior change
1687: ninja/mac: Don't write emtpy postbuild variable for non-bundle links.
1688: ninja: Reduce scope of a variable, no behavior change
1689: ninja: Give WriteSources() and WriteLink() an explicit ninja_file parameter.
1690: ninja: Let WriteLink() return the linked binary, no behavior change.
1691: Linux: make ninja respect environment: CFLAGS, CXXFLAGS, LDFLAGS
1692: ninja/mac: Support multi-arch builds via ARCHS
1693: ninja/mac: Warn on conditional keys.

BUG=90185
TBR=scottmg

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=217040

[commit-bot: I haz the power, 2013-08-12 15:58:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/22825003/1

[scottmg, 2013-08-12 16:23:44]

lgtm

[commit-bot: I haz the power, 2013-08-12 18:10:31]

Change committed as 217040