media library: add amrec file extension

amrec is a synonym for MPEG TS used by certain camera systems.

(cherry picked from commit 7072c155)
13 jobs for !658 with 0.10.x in 4 minutes and 48 seconds (queued for 1 minute and 37 seconds)
merge request
Name Stage Failure
failed
run-bench Run Bench
[78/79] Linking target benchmark/url/bench_url
[79/79] Linking target benchmark/requests/bench_requests
$ curl -f -L https://artifacts.videolan.org/medialibrary/gen-bench-db/bench.$BENCH_DB_SUFFIX.db -o bench.db
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (22) The requested URL returned error: 404
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1