D7680: Fix build without KDocTools

[Volker Krause]

This revision was automatically updated to reflect the committed changes.
Closed by commit R242:18d04e9b4142: Fix build without KDocTools (authored by vkrause).

REPOSITORY
  R242 Plasma Framework (Library)

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D7680?vs=19144&id=19854

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

AFFECTED FILES
  CMakeLists.txt

To: vkrause, #frameworks
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