[Pkg-shadow-devel] Bug#814670: Possible fix for su - / su -l and XDG_RUNTIME_DIR

[Vivek Das Mohapatra]

The attached patch adds a pam profile for su -l (and su -),
patches su to use that profile if su - is used, and adds a
pseudo-xdg-session pam module.

It isn't possible to guarantee there's a "real" XDG session
for that user for the su - session to join, and you making logind
handle su - and similar sessions properly requires a fair bit of
surgery, so we set up a summy XDG_RUNTIME_DIR instead.
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