- Fixup pam stack a bit more (boo#1176338):
+ Do not create hardlinks between lightdm pam files and xdm's pam
files, but install explicit lightdm pam stack that @includes
xdm. This has the advantage that, if an admin creates
/etc/pam.d/xdm, we will follow this right away. With the
hardlinks, the /usr/etc/pam.d/xdm would still be used, which
might not be the expected outcome.