D27863: Revert "Make it compile against last qt5.15 without deprecated method. QProcess::execute(QString) is deprecated"

[Fabian Vogt]

fvogt added a reviewer: mlaurent.

REPOSITORY
  R268 KGlobalAccel

REVISION DETAIL
  https://phabricator.kde.org/D27863

To: fvogt, #frameworks, mlaurent
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns