Fix Linker command fail error when archiving for Xcode 4.6 with phonegap v2.9

1. In your Target's Build Settings, find Other Linker Flags
2. Change $(TARGET_BUILD_DIR)/libCordova.a
3. To $(BUILT_PRODUCTS_DIR)/libCordova.a

from:Building an archive for XCode 4.6 release with phonegap v 2.9 fails