D9225: Fix building autotest on platforms where syscalls are not available

[David Edmundson]

davidedmundson accepted this revision.

REPOSITORY
  R133 KScreenLocker

REVISION DETAIL
  https://phabricator.kde.org/D9225

To: bshah, #plasma, fvogt, graesslin, davidedmundson
Cc: davidk, graesslin, davidedmundson, plasma-devel, ZrenBot, progwolff, 
lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart