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
diff --git a/debugger.gyp b/debugger.gyp
index c37c9c6..32afe7c 100644
--- a/debugger.gyp
+++ b/debugger.gyp
@@ -72,6 +72,9 @@
         }],
         [ 'skia_os == "mac"', {
           'mac_bundle' : 1,
+          'mac_framework_dirs': [
+            '/Library/Frameworks',
+          ],
           'include_dirs': [
             '/Library/Frameworks/QtCore.framework/Headers/',
             '/Library/Frameworks/QtGui.framework/Headers/',