Add support for CONFIGURATION_NAME to ninja.
Add support for CONFIGURATION_NAME to ninja.

Patch from Benjamin Lerman <qsr@chromium.org>!
Review URL: https://chromiumcodereview.appspot.com/10778037/
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google