Tests will now be built at `meson test`-time, so there's no cost if the
user isn't going to run them.
This is better than guarding on build type, as distros may want to test production
builds before shipping.
Signed-off-by: Sam James <sam@gentoo.org>
This is more elegant as a meson feature option because feature options
propagate in a useful way to `dependency(..., required: ...)`.
Without this, the option was ignored. Wiring it up naively meant that
disabling it still searched for libbsd as well, so a feature option
is the best fit.
Also, mark it as a dependency of `arc4random`.
Signed-off-by: Sam James <sam@gentoo.org>
Sam James