added __POWERPC__ define to compilation flags for Mac OS X
do not add _REENTRANT define to compilation flags for Mac OS X disable drag and drop for Mac OS X (not yet supported) git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9603 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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