D21313: Create specific directory for kdebugsettings categories file

[Luca Beltrame]

lbeltrame added a subscriber: cgiboudeaux.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D21313

To: mlaurent, dfaure
Cc: cgiboudeaux, kde-frameworks-devel, kde-buildsystem, bencreasy, michaelh, 
ngraham, bruns