MFH: r499419

multimedia/dav1d: update to 0.2.2

Changes: https://code.videolan.org/videolan/dav1d/tags/0.2.2
Changes: https://code.videolan.org/videolan/dav1d/blob/0.2.2/NEWS
Changes: https://code.videolan.org/videolan/dav1d/compare/0.2.1...0.2.2
Approved by: ports-secteam blanket (required by Firefox 68)