mp4v2: revert to 1.9.1

mediatomb (and possibly other software) does not build against mp4v2 2.0.0
mediatomb: add deps, fix build

Fixes #17999.
Closes #18451.
Closes #19445.
Closes #20759.
Closes #20838.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>