Fixes for building wxGTK under Cygwin.

Test for __WXMSW__ instead of __CYGWIN__ to not affect building non-MSW ports
such as wxGTK under Cygwin.

See #14382.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71799 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/app.h

@@ -494,7 +494,7 @@ protected:
     wxDECLARE_NO_COPY_CLASS(wxAppConsoleBase);
 };
 
-#if defined(__UNIX__) && !defined(__CYGWIN__)
+#if defined(__UNIX__) && !defined(__WXMSW__)
     #include "wx/unix/app.h"
 #else
     // this has to be a class and not a typedef as we forward declare it