D25210: Prepare KConfigSkeletonItem to allow inheriting its private class

[Volker Krause]

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

REPOSITORY
  R237 KConfig

REVISION DETAIL
  https://phabricator.kde.org/D25210

To: ervin, #frameworks, dfaure, davidedmundson, bport, crossi, vkrause
Cc: vkrause, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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