D9408: extractors: Hide warnings from system headers

[Matthieu Gallien]

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

REPOSITORY
  R286 KFileMetaData

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9408

To: kfunk, mgallien
Cc: #frameworks, ashaposhnikov, michaelh, astippich, spoorun, bruns
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