D26564: Clean kbuildsycoca4 support

[David Faure]

dfaure added a reviewer: hein.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D26564

To: meven, ervin, #frameworks, hein
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns