bug#44018: Don't consider play-sound-file to be a 'safe' function

[Stefan Kangas]

Mattias Engdegård <mattiase@acm.org> writes:

> Given Lars's approval and the lack of further objections, I'm removing 
> play-sound-file from the list of safe functions in unsafep.el.

FWIW, I agree with this change.  There have been many vulnerabilities
in this area, for example in the Linux kernel drivers.  Who knows what
else is out there.

See, for example:
https://nvd.nist.gov/vuln/search/results?form_type=Basic&results_type=overview&query=linux+audio&search_type=all