lib: add media_player synchronisation functions
Related to #28524
Tested in the future LibVLC 4.0 API rework branch here: !3503 (7c9f3428)
Edited by Thomas Guillem
Related to #28524
Tested in the future LibVLC 4.0 API rework branch here: !3503 (7c9f3428)
VideoLAN code repository instance