package/jack2: add optional support for opus

When opus was compiled before, jack2 will use it as optional dependency:

$ output/host/usr/bin/x86_64-linux-readelf -a output/target/usr/bin/jackd | grep NEEDED
 0x0000000000000001 (NEEDED)             Shared library: [libjackserver.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libopus.so.0]
[...]

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>