D5955: Fix compilation on CentOS 6

[Kevin Funk]

kfunk added a reviewer: jriddell.

REPOSITORY
  R111 KSysguard Library

REVISION DETAIL
  https://phabricator.kde.org/D5955

To: kfunk, jriddell
Cc: plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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