package/x11r7/xserver_xorg-server: security bump to version 1.17.1

Fixes:

CVE-2015-0255 - Information leak in the XkbSetGeometry request of X servers
http://www.x.org/wiki/Development/Security/Advisory-2015-02-10/



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>