compilation fix for wxUSE_DATAOBJ == 0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30920 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/dataobj.cpp

@@ -13,6 +13,8 @@
 
 #include "wx/defs.h"
 
+#if wxUSE_DATAOBJ
+
 #include "wx/dataobj.h"
 #include "wx/mstream.h"
 #include "wx/app.h"
@@ -379,3 +381,5 @@ void wxBitmapDataObject::DoConvertToPng()
 #endif
 }
 
+#endif // wxUSE_DATAOBJ
+