D5413: makes KArchive be optional and do not build extractors needing it

[David Faure]

dfaure accepted this revision.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D5413

To: mgallien, kfunk, dfaure
Cc: kfunk, heikobecker, dfaure, #frameworks
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