One of the QtMultimedia backends is implemented using FFmpeg.
This provisioning enables building and testing of this backend.
Change-Id: Ia196c2ae4b457aa6b8e3ee8e0f367197aadfe0d9
Reviewed-by: Simo Fält <simo.falt@qt.io>
(cherry picked from commit a273e9f11c)
Reviewed-by: Lars Knoll <lars@knoll.priv.no>
