Bug#804280: release-notes: [stretch] Document X11 non-setuid change

[Niels Thykier <niels@thykier.net>]

Package: release-notes
Tags: stretch

Hi,

The following change should be documented for Stretch:

"""
xorg-server (2:1.17.3-1) unstable; urgency=medium

  The Xorg server is no longer setuid root by default.  This change
reduces the
  risk of privilege escalation due to X server bugs, but has some side
effects:

  * it relies on logind and libpam-systemd
  * it relies on a kernel video driver (so the userspace component doesn't
    touch the hardware directly)
  * it needs X to run on the virtual console (VT) it was started from
  * it changes the location for storing the Xorg log from /var/log/ to
    ~/.local/share/xorg/

  On systems where those are not available, the new xserver-xorg-legacy
package
  is needed to allow X to run with elevated privileges.  See the
  Xwrapper.config(5) manual page for configuration details.

 -- Julien Cristau <jcristau@debian.org>  Tue, 27 Oct 2015 22:54:11 +0000
"""