Fix wxGTK 1 build after gtk/gtk.h wrapper header addition

Changes of c0b0562533 to common code broke
wxGTK1 build, as wx/gtk/private/wrapgtk.h is for wxGTK 2+ only.

Fix this by handling wxGTK 1 separately and including gtk/gtk.h directly
for it.

Hopefully this code will be removed, together with the rest of wxGTK1
support, in some not so distant future.

src/generic/graphicc.cpp

@@ -83,7 +83,11 @@ using namespace std;
 #endif
 
 #ifdef __WXGTK__
+#ifdef __WXGTK20__
 #include "wx/gtk/private/wrapgtk.h"
+#else // GTK+ 1.x
+#include <gtk/gtk.h>
+#endif
 #include "wx/fontutil.h"
 #ifndef __WXGTK3__
 #include "wx/gtk/dc.h"