remove file containing many obsolete defines, if anyone wants to revive MicroWindows support the MicroWin-specific checks should be added to wx/msw/chkconf.h or wx/msw/microwin/chkconf.h
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47517 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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