Backport of "fdkaacdec: Support up to 5 rear channels" into 1.22
Backport of !4712 (merged) "fdkaacdec: Support up to 5 rear channels".
Commits:
- 4008b872 fdkaacdec: Support up to 5 rear channels
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Backport of !4712 (merged) "fdkaacdec: Support up to 5 rear channels".
Commits: