Allow Xcode to change paths to frameworks based on whether a device or simulator was selected.

R=caryclark@google.com
Review URL: https://codereview.appspot.com/6590068

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@5802 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed