Fix Xcode 4.x debugger build

Adding a mac_framework_dirs entry to help Xcode find the Qt frameworks.

R=djsollen@google.com

BUG=

Review URL: https://codereview.appspot.com/6564056

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@5702 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed