Don't rely on the reported supported mimetypes from Phonon,
Phonon supports more than just video and audio, but if it is
video or audio there's a very good chance Phonon supports it.

(If the mime type isn't in the list returned by Phonon there's
still a good chance it supports it, because mime types are stupid.)

BUG: 252539
FIXED-IN: 4.9.1

(cherry picked from commit 2fb4419d)