Bug#752029: mate-desktop-environment: mate-settings-daemon memory accumulation

[Vlad Orlov]

Ok, I just wanted to eliminate the possible return of the notorious XDG_RUNTIME_DIR systemd bug [1].

There's an upstream report about the memory usage of mate-settings-daemon [2]. Some comments
are obviously related to [1], but others seem to indicate that mate-settings-daemon may eat so much
memory under some other circumstances.

[1] https://bugs.debian.org/731300
[2] https://github.com/mate-desktop/mate-settings-daemon/issues/44