Currently, several components select atsc_a53, despite not using anything from it themselves. They only select it because parsing SEI messages adds an indirect dependency. But using direct dependencies is more natural, so add dedicated subsystems for them. It already allows to remove a superfluous dependency of the HEVC QSV encoder on hevc_sei and atsc_a53. Adding new subsystems only becomes effective after a reconfiguration. In order to force this, some needed headers (which are only included implicitly before this commit) were included explicitly in libavformat/allformats.c. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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