Teach Ninja generator about 'AR' in 'make_global_settings'

With this CL, 'AR' in 'make_global_settings' can be recognized by Ninja generator, like Make generator. This makes it easier for you to share the code among host/NaCl/NDK/Emscripten build targets.

Note that 'AR.host' is not yet supported with this CL.

R=scottmg@chromium.org, torne@chromium.org

Review URL: https://codereview.chromium.org/321843002

git-svn-id: http://gyp.googlecode.com/svn/trunk@1935 78cadc50-ecff-11dd-a971-7dbc132099af
2 files changed