D26626: Allow to also pass a target instead of list of sources to KCONFIG_ADD_KCFG_FILES

[David Redondo]

davidre added reviewers: Frameworks, Build System.

REPOSITORY
  R237 KConfig

REVISION DETAIL
  https://phabricator.kde.org/D26626

To: davidre, #frameworks, #build_system
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns