Re-added a minimal setup.h file that includes wx/msw/setup.h on Windows,

complains on Unix.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13803 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/setup.h

@@ -0,0 +1,14 @@
+/*
+ * wx/setup.h
+ *
+ * This file should not normally be used, except where makefiles
+ * have not yet been adjusted to take into account of the new scheme
+ * whereby a setup.h is created under the lib directory.
+ */
+
+#ifdef __WXMSW__
+#include "wx/msw/setup.h"
+#else
+#error Please adjust your include path to pick up the wx/setup.h file under lib first.
+#endif
+