Backported from X.org:

   commit fc7fb5bbe1c8f787e53500b9a2ca4af815f310d1
   Author: Giuseppe Bilotta giuseppe.bilotta@gmail.com
   Date: Thu Nov 9 10:21:21 2017 +0100

   randr: free crtc->outputs on destroy
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>

Fixes ArcticaProject/nx-libs#558