D20324: Fix build with exiv2 0.28

[Stefan Brüns]

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

REPOSITORY
  R286 KFileMetaData

BRANCH
  exiv

REVISION DETAIL
  https://phabricator.kde.org/D20324

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