[ksmserver] Remove obsolete KDELibs4Support dependency
Summary:
The inhibition was dysfunctional, as powerdevil delays the inhibition
by 5 seconds (and is already stopped when the delay times out). Also
powerdevil handles concurrent user session shutdowns and sleep requests
itself, so the code is obsolete.
As KDELibs4Support pulled in a number of Frameworks, we have to
explicitly add these now.
Reviewers: Plasma, broulik, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: apol, sitter, anthonyfieroni, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D22296