Remove one more kdelibs4support
Summary:
Using the DBus API directly is done in both powerdevil and kscreen ATM.
Leaving the time dataengine the odd one out. It's also not used on Linux
where we use the more appropriate kernel signal, so linking a dead library is
extra pointless
Test Plan: Tested compile by altering some #ifdefs
Reviewers: Plasma
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11966