Support for automatic setup.h in OS/2 with OW builds. __WXOS2__ final removal. Source cleaning.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36024 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/wxprec.h

@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        wxprec.h
+// Name:        wx/wxprec.h
 // Purpose:     Includes the appropriate files for precompiled headers
 // Author:      Julian Smart
 // Modified by:
@@ -50,6 +50,11 @@
 #   include <PalmOS.h>
 #endif
 
+// include <os2.h>
+#ifdef __OS2__
+#   include "wx/os2/private.h"
+#endif
+
 // include the most common wx headers
 #include "wx/wx.h"