we need our own implementation because in wxmac wxIcon does not inherit from wxBitmap anymore

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33141 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/wxWindows.xcode/project.pbxproj

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