D29834: Fixes mountiso plugin build failure.

[Nikolai Krasheninnikov]

nikolaik added reviewers: Dolphin, elvisangelaccio, meven, kchoi.

REPOSITORY
  R449 Plugins for Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D29834

To: nikolaik, #dolphin, elvisangelaccio, meven, kchoi
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