D6024: Fix detection of sys/event.h on FreeBSD < 12

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R133 KScreenLocker

BRANCH
  Plasma/5.10

REVISION DETAIL
  https://phabricator.kde.org/D6024

To: tcberner, #freebsd, davidedmundson
Cc: plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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