D16619: add missing license information

[Aleix Pol Gonzalez]

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

REPOSITORY
  R286 KFileMetaData

BRANCH
  license

REVISION DETAIL
  https://phabricator.kde.org/D16619

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