D7653: Do not hard runtime depend on X11 in RuleBook

[Martin Flöser]

graesslin created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  The RuleBook is created during Workspace startup, so it's a required
  component for the overall KWin session. It uses a KXMessages object which
  means it has a hard X11 runtime dependency.
  
  This change makes the dependency optional and creates the KXMessages once
  X11 is available.

TEST PLAN
  Compiles

REPOSITORY
  R108 KWin

BRANCH
  rulebook-no-x11

REVISION DETAIL
  https://phabricator.kde.org/D7653

AFFECTED FILES
  rules.cpp
  rules.h

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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