D19223: Fix releaseme checkout when this is included in a sub-directory

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19223

To: vkrause, apol
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns