D16732: Start xclipboard sync process from build dir if available

graesslin created this revision.
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REVISION SUMMARY
  The xclipboard sync test times out on build.kde.org as KWin is not
  installed prior to running the tests. This is due to KWin not finding
  the executable for the clipboard sync helper.
  
  This change looks whether the binary exists in the same directory as
  KWin's executable. If it exists it is started instead of the hardcoded
  path in libexec.

TEST PLAN
  Run the test and verified the correct binary is loaded

REPOSITORY
  R108 KWin

BRANCH
  xclipboard-sync-binary-dir

REVISION DETAIL
  https://phabricator.kde.org/D16732

AFFECTED FILES
  wayland_server.cpp

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