Add configure test for presence/compilabilty of multimon.h and display.h
header whcih are required for dsrc/msw/display.cpp - but aren't included in mingw. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26835 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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