D20138: Add a helper to determine actual supported parent mime type

[Stefan Brüns]

bruns added a dependent revision: D20139: [TagLibExtractor] Use the correct mimetype in case of inheritance.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D20138

To: bruns, #baloo, #frameworks, ngraham, astippich
Cc: kde-frameworks-devel, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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