Modify dist gdk-pixbuf.loaders instead of gtk

setup.py

@@ -162,7 +162,7 @@ if os.name == 'nt':
         query_loaders = Popen(os.path.join(gtk_dir,'bin','gdk-pixbuf-query-loaders'),
             stdout=PIPE).stdout.read()
         query_loaders = query_loaders.replace(gtk_dir.replace(os.sep, '/') + '/', '')
-        loaders = open(os.path.join(gtk_dir, 'etc', 'gtk-2.0', 'gdk-pixbuf.loaders'), 'w')
+        loaders = open(os.path.join(dist_dir, 'etc', 'gtk-2.0', 'gdk-pixbuf.loaders'), 'w')
         loaders.writelines([line + "\n" for line in query_loaders.split(os.linesep)])
         loaders.close()