CommandLauncherJob: add setProcessEnvironment(QProcessEnvironment)
This is going to be needed by KTerminalLauncherJob (https://phabricator.kde.org/T14329) and can obviously be useful in other cases.
This is going to be needed by KTerminalLauncherJob (https://phabricator.kde.org/T14329) and can obviously be useful in other cases.