Don't really know why this section was disabled, but without it,
certain pPicture resources do not get free'd until later in the
FreeClientResources() process after the screen has been free'd -
resulting in seg fault.
With this patch, all resources normally free'd using vanilla X are
now also being freed correctly by Xdmx.
https://bugs.freedesktop.org/show_bug.cgi?id=24576
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>