D16763: Support starting the killer_helper from build dir

graesslin created this revision.
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REVISION SUMMARY
  As with all libexec executables we first need to test whether the binary
  is available in the application's directory and start this, otherwise
  the system wide installed one.
  
  See: https://community.kde.org/Guidelines_and_HOWTOs/Making_apps_run_uninstalled

REPOSITORY
  R108 KWin

BRANCH
  killer-helper-from-build

REVISION DETAIL
  https://phabricator.kde.org/D16763

AFFECTED FILES
  client.cpp

To: graesslin, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart