Added missing includes for non-precompiled headers.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9844 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/palette.cpp

@@ -14,13 +14,16 @@
 
 #ifndef WX_PRECOMP
 #include <stdio.h>
+#include "wx/defs.h"
 #include "wx/setup.h"
+#include "wx/string.h"
+#include "wx/os2/private.h"
 #include "wx/palette.h"
+#include "wx/app.h"
 #endif
 
 #define INCL_PM
 #define INCL_GPI
-#include <os2.h>
 
 #include "assert.h"