alsa-card-profiles: simplify adding custom profiles
It is sometimes useful to add a custom profile-set.
For that, e.g. default.conf
needs to be modified.
(at least, i have not succeeded in just adding a new file)
But that change gets overridden when the package is updated,
which could be extremely dangerous, e.g. if said profile
changed the volume-limit
.
By shipping an "empty" 9999-custom.conf
,
the update becomes less problematic,
because one can now use e.g. dpkg-divert
on said file.
Refs. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050293