MFH: r476022

The webservice that audio/libmusicbrainz3 interfaces with will cease operation
on 2018-08-01. Add upstream patch to use audio/libmusicbrainz5 for track lookup
operations instead.

Reviewed by: rakuco
Obtained from: KDE git repo
Differential Revision: https://reviews.freebsd.org/D16536

Approved by: ports-secteam (blanket)