[apparmor] [patch] fix abstractions/X for new gdm path to Xauthority

[Seth Arnold]

Bruce Pieterse reports that AppArmor denied evince, among other
applications, from starting properly:
https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1432126

He tested a slight variant of the attached patch and reported success. I
propose this patch for both trunk and 2.9.

Signed-off-by: Seth Arnold <seth.arnold at canonical.com>

Thanks
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