Compilation fixes for VC6 after MSWGetComboBoxInfo() introduction.

Don't use COMBOBOXINFO outside of WINVER checks, we can only use
tagCOMBOBOXINFO that we forward declared ourselves.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72980 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/combobox.cpp

@@ -377,9 +377,13 @@ bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 
 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 {
+    // FIXME-VC6: Only VC6 needs this guard, see WINVER definition in
+    //            include/wx/msw/wrapwin.h
+#if defined(WINVER) && WINVER >= 0x0500
     WinStruct<COMBOBOXINFO> info;
     if ( MSWGetComboBoxInfo(&info) )
         return info.hwndItem;
+#endif // WINVER >= 0x0500
 
     if (HasFlag(wxCB_SIMPLE))
     {