Runtime tested inside jail via `aplay`.
```
$ poudriere testport -j 132amd64 audio/alsa-plugins
[...]
=>> Checking shared library dependencies
0x0000000000000001 NEEDED Shared library: [libasound.so.2]
0x0000000000000001 NEEDED Shared library: [libc.so.7]
0x0000000000000001 NEEDED Shared library: [libthr.so.3]
$ poudriere testport -j 132amd64 audio/alsa-plugins~ffmpeg
[...]
=>> Checking shared library dependencies
0x0000000000000001 NEEDED Shared library: [libasound.so.2]
0x0000000000000001 NEEDED Shared library: [libavcodec.so.60]
0x0000000000000001 NEEDED Shared library: [libavutil.so.58]
0x0000000000000001 NEEDED Shared library: [libc.so.7]
0x0000000000000001 NEEDED Shared library: [libswresample.so.4]
$ poudriere testport -j 132amd64 audio/alsa-plugins~jack
[...]
=>> Checking shared library dependencies
0x0000000000000001 NEEDED Shared library: [libasound.so.2]
0x0000000000000001 NEEDED Shared library: [libc.so.7]
0x0000000000000001 NEEDED Shared library: [libjack.so.0]
0x0000000000000001 NEEDED Shared library: [libthr.so.3]
$ poudriere testport -j 132amd64 audio/alsa-plugins~pulseaudio
[...]
=>> Checking shared library dependencies
0x0000000000000001 NEEDED Shared library: [libasound.so.2]
0x0000000000000001 NEEDED Shared library: [libc.so.7]
0x0000000000000001 NEEDED Shared library: [libpulse.so.0]
0x0000000000000001 NEEDED Shared library: [libthr.so.3]
$ poudriere testport -j 132amd64 audio/alsa-plugins~samplerate
[...]
=>> Checking shared library dependencies
0x0000000000000001 NEEDED Shared library: [libasound.so.2]
0x0000000000000001 NEEDED Shared library: [libc.so.7]
0x0000000000000001 NEEDED Shared library: [libsamplerate.so.0]
$ poudriere testport -j 132amd64 audio/alsa-plugins~speex
[...]
=>> Checking shared library dependencies
0x0000000000000001 NEEDED Shared library: [libasound.so.2]
0x0000000000000001 NEEDED Shared library: [libc.so.7]
0x0000000000000001 NEEDED Shared library: [libspeexdsp.so.1]
```