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@5802 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/SimpleiOSApp.gyp b/gyp/SimpleiOSApp.gyp
index 5b69e64..ea702be 100644
--- a/gyp/SimpleiOSApp.gyp
+++ b/gyp/SimpleiOSApp.gyp
@@ -39,12 +39,12 @@
       ],
       'link_settings': {
         'libraries': [
-          '<(ios_sdk_dir)<(ios_sdk_version).sdk/System/Library/Frameworks/CoreGraphics.framework',
-          '<(ios_sdk_dir)<(ios_sdk_version).sdk/System/Library/Frameworks/CoreText.framework',
-          '<(ios_sdk_dir)<(ios_sdk_version).sdk/System/Library/Frameworks/Foundation.framework',
-          '<(ios_sdk_dir)<(ios_sdk_version).sdk/System/Library/Frameworks/ImageIO.framework',
-          '<(ios_sdk_dir)<(ios_sdk_version).sdk/System/Library/Frameworks/MobileCoreServices.framework',
-          '<(ios_sdk_dir)<(ios_sdk_version).sdk/System/Library/Frameworks/UIKit.framework',
+          '$(SDKROOT)/System/Library/Frameworks/CoreGraphics.framework',
+          '$(SDKROOT)/System/Library/Frameworks/CoreText.framework',
+          '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
+          '$(SDKROOT)/System/Library/Frameworks/ImageIO.framework',
+          '$(SDKROOT)/System/Library/Frameworks/MobileCoreServices.framework',
+          '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
         ],
         'libraries!': [
           #remove mac dependencies