audio/linux-c7-alsa-plugins-oss: install vendor config after 077152a79ad8

linux-c7-alsa-lib uses default config from alsa-lib since 1aaf3941aa56.

$ /compat/linux/usr/bin/aplay foo.wav
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM oss
aplay: main:828: audio open error: No such file or directory

PR: 245321