shout: fix deprecated functions and bump requirement/contribs

Merged Alexandre Janniaux requested to merge alexandre-janniaux/vlc:shout-deprecated/1 into master
  • Contribs: 2.4.6
  • Requirement: 2.4.3 (for the shout_set_content_format function).

Draft because I can probably simplify the rules and patch more.

Edited by Alexandre Janniaux

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