D6631: Fix compilation with strict libc (such as musl)

[Marco Martin]

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

REPOSITORY
  R106 KSysguard

REVISION DETAIL
  https://phabricator.kde.org/D6631

To: mpyne, #plasma, mart
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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