fix gm build on Mac
see http://codereview.appspot.com/4571044/



git-svn-id: http://skia.googlecode.com/svn/trunk@1494 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/utils.gyp b/gyp/utils.gyp
index c0db053..59c5bb5 100644
--- a/gyp/utils.gyp
+++ b/gyp/utils.gyp
@@ -96,6 +96,11 @@
           'sources!': [
             '../src/utils/SkEGLContext_none.cpp',
           ],
+          'link_settings': {
+            'libraries': [
+              '$(SDKROOT)/System/Library/Frameworks/AGL.framework',
+            ],
+          },
         }],
         [ 'OS != "linux" and OS != "freebsd" and OS != "openbsd" and OS != "solaris"', {
           'sources!': [