Added yet another include for EMX.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17954 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/toplevel.cpp

@@ -37,6 +37,7 @@
     #include "wx/frame.h"
     #include "wx/control.h"
     #include "wx/containr.h"        // wxSetFocusToChild()
+    #include "wx/module.h"        // wxSetFocusToChild()
 #endif //WX_PRECOMP
 
 #include "wx/os2/private.h"