D5677: Fix clearing recent usage history

[Heiko Becker]

heikobecker created this revision.

REVISION SUMMARY
  The old method is gone with Plasma 4. Instead go through
  kactivitymanagerd. Also, instead of checking at build time for
  Q_WS_X11 (gone with Qt4), look at dbus if kactivitymanagerd's
  service is registered to determine if the action should be
  displayed.

TEST PLAN
  Checked with kactivitymanagerd available/unavailable on dbus.
  Successfully removed the history.

REPOSITORY
  R364 Sweeper

BRANCH
  frameworks

REVISION DETAIL
  https://phabricator.kde.org/D5677

AFFECTED FILES
  privacyfunctions.cpp
  privacyfunctions.h
  sweeper.cpp

To: heikobecker, kde-utils-devel
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