wayland_server: handle suspend inhibition for kscreenlocker too

Xaver Huglrequested to merge
work/zamundaaa/unify-inhibit into master

Each process can only have one inhibition at a time, so if KWin and kscreenlocker both delay suspend, one of their requests fails. This instead puts the inhibition file descriptor into a shared_ptr and shares it between workspace and the screenlocker.

Depends on kscreenlocker!306 (merged)

CCBUG: 515550 CCBUG: 513150

Edited by Xaver Hugl

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