Bug#924785: remove mlockall() call

[Mike Gabriel <mike.gabriel@das-netzwerkteam.de>]

Package: arctica-greeter
Version: 0.99.1.1-2
Severity: grave

According to systemd-dev,

"""
mlockall() is generally a bad idea and certainly has no place in a  
graphical program.
A program like this uses lots of memory and it is crucial that this  
memory can be paged
out to relieve memory pressure."

With systemd version 239 the ulimit for RLIMIT_MEMLOCK was set to 16 MiB
and therefore the mlockall call would fail. This is lucky becasue the  
subsequent mmap would not fail.

With systemd version 240 the RLIMIT_MEMLOCK is now set to 64 MiB
and now the mlockall no longer fails. However, it not possible to mmap in all
the memory and because that would still exceed the MEMLOCK limit.
"""

See https://bugzilla.redhat.com/show_bug.cgi?id=1662857 &
https://github.com/CanonicalLtd/lightdm/issues/55

RLIMIT_MEMLOCK = 64 MiB means, arctica-greeter will most likely fail  
with 64 bit and
will always fail on 32 bit systems.

Hence we better disable it.

Thanks to the slick-greeter and unity-greeter devs who already fixed  
the issues there upstream. Arctica Greeter ported that patch and the  
patch needs to be applied against arctica-greeter in Debian buster, as  
buster ships systemd > version 240.

Mike

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