removed all compile- and run-time checks for GTK+ < 2.4; don't include the generic files which are now never used in wxGTK in the build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49660 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/artgtk.cpp

@@ -257,11 +257,8 @@ wxBitmap wxGTK2ArtProvider::CreateBitmap(const wxArtID& id,
         stockid = id.ToAscii();
 
     GdkPixbuf *pixbuf = CreateStockIcon(stockid, stocksize);
-
-    if (!pixbuf && !gtk_check_version(2,4,0))
-    {
+    if (!pixbuf)
         pixbuf = CreateThemeIcon(stockid, stocksize, size);
-    }
 
     if (pixbuf && size != wxDefaultSize &&
         (size.x != gdk_pixbuf_get_width(pixbuf) ||