Compilation fixes for old SDKs (VC6) after recent commit.

Define WM_QUERYUISTATE in wx/msw/missing.h too as src/msw/statbox.cpp uses it
now.

Also move DT_HIDEPREFIX definition from wx/msw/private/button.h to missing.h
as well as it's now used in statbox.cpp too. Include missing.h explicitly from
the files that use DT_HIDEPREFIX.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65582 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/button.cpp

@@ -45,6 +45,7 @@
 #include "wx/msw/private/button.h"
 #include "wx/msw/private/dc.h"
 #include "wx/private/window.h"
+#include "wx/msw/missing.h"
 
 using namespace wxMSWImpl;