compilation fixes for wxUSE_IMAGE==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47324 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/region.h

@@ -37,6 +37,7 @@ public:
 
     wxRegion( size_t n, const wxPoint *points, int fillStyle = wxODDEVEN_RULE );
 
+#if wxUSE_IMAGE
     wxRegion( const wxBitmap& bmp)
     {
         Union(bmp);
@@ -46,6 +47,7 @@ public:
     {
         Union(bmp, transColour, tolerance);
     }
+#endif // wxUSE_IMAGE
 
     virtual ~wxRegion();