gtk version check should be runtime, not compile time

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46094 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/dcclient.cpp

@@ -1113,13 +1113,12 @@ void wxGTKWindowImplDC::DoDrawBitmap( const wxBitmap &bitmap,
     if ((w != ww) || (h != hh))
         use_bitmap = use_bitmap.Rescale( 0, 0, ww, hh, ww, hh );
 
-#if !GTK_CHECK_VERSION(2,2,0)
     // NB: We can't render pixbufs with GTK+ < 2.2, we need to use pixmaps code.
     //     Pixbufs-based bitmaps with alpha channel don't have a mask, so we
     //     have to call GetPixmap() here -- it converts the pixbuf into pixmap
     //     and also creates the mask as a side-effect:
-    use_bitmap.GetPixmap();
-#endif
+    if (gtk_check_version(2,2,0))
+        use_bitmap.GetPixmap();
 
     // apply mask if any
     GdkBitmap *mask = (GdkBitmap *) NULL;