libvlc: Backport !1511 and update to version 3.0.17.2

This backports vlc!1511 (merged) to update libdsm contrib (and switch to meson), and use the new API to interrupt the I/O, easily pluggable with the vlc interrupt API.

This fixes the input_thread_t blockage when using libdsm and when having networks issues.

This backport was done manually to VLCKit as there are currently no plans to do it on the mainline branch.

Additionally, this MR adds custom bitcode to libvlc's contrib system and updates the tested hash to match version 3.0.17.2.