This partially undoes the changes of r73290 by keeping __WXMSW__ defined for
the console mode user applications and only undefining it when building
wxWidgets itself.
This allows the existing code using __WXMSW__ to continue compiling correctly
with wxWidgets 3.0.
Closes#15579.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75006 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775