[TIMOB-17808] Fixed bug in Titanium SDK 3 bug fix hook where Xcode should only be removed when running on OS X.
Updated changelog.
Merge pull request #164 from appcelerator/timob-17808_3_4_X

[TIMOB-17808] Fixed bug in Titanium SDK 3 bug fix hook where Xcode should only be removed when running on OS X.