issue #2325: Fixing an issue that Xcode doesn't rebuild app when source file updated in dependent static library.
Merge pull request #2993 from dumganhar/iss2325-ios-workspace-dependence-fix

issue #2325: Fixing an issue that Xcode doesn't rebuild app when source file updated in dependent static library.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop