D6752: Fix build with ocaml 4.04

[Christoph Feck]

cfeck accepted this revision.
cfeck added a comment.
This revision is now accepted and ready to land.


  Can you commit to 17.08 branch?

REPOSITORY
  R326 Kalzium

REVISION DETAIL
  https://phabricator.kde.org/D6752

To: joselema, #kde_edu, cfeck
Cc: thomasp, arojas, cfeck, apol
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