D6752: Fix build with ocaml 4.04

[Thomas Posch]

thomasp added a comment.


  fixes the problem for me on gentoo using ocaml-4.04.2

REPOSITORY
  R326 Kalzium

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

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