D7680: Fix build without KDocTools

[Volker Krause]

vkrause created this revision.
Restricted Application added a project: Frameworks.

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7680

AFFECTED FILES
  CMakeLists.txt

To: vkrause, #frameworks
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