change generic ints to enums in wxDC (closes #9959)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57907 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/metafile.cpp

@@ -275,7 +275,7 @@ wxMetafile *wxMetafileDCImpl::Close()
     return NULL;
 }
 
-void wxMetafileDCImpl::SetMapMode(int mode)
+void wxMetafileDCImpl::SetMapMode(wxMappingMode mode)
 {
     m_mappingMode = mode;