D5955: Fix compilation on CentOS 6

[Aleix Pol Gonzalez]

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

REPOSITORY
  R111 KSysguard Library

BRANCH
  master

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

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