Enable finding the wxWidgets folder as a subdir of the main Phoenix folder.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73721 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add a setup.py to the tarball to bootstrap automated builds made by pip or easy_install.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73722 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775