arc4random - are you sure we want these?

[Florian Weimer]

* Rich Felker:

> AT_RANDOM is unusable as a fallback here because it's equivalent to
> GRND_INSECURE. It's silently broken at early boot time. In musl we're
> likely going to end up using the legacy SYS_sysctl on pre-getrandom
> kernels even though it spammed syslog just because it seems to be the
> only way to get blocking secure entropy on those kernels.

Even pre-getrandom, sysctl was rarely enabled in kernel configurations
if I recall correctly.  I doubt it is an option to avoid process
termination with old kernels/seccomp filters.

Thanks,
Florian