Use seedrng for seeding the random number generator

The RNG can't actually be seeded from a shell script, due to the
reliance on ioctls. For this reason, the seedrng project provides a
basic script meant to be copy and pasted into projects like void-runit
and tweaked as needed: <https://git.zx2c4.com/seedrng/about/>.

This commit imports it into void-runit and wires up the init scripts to
call it. This also is a significant improvement over the current init
script, which fails to remove seed files that have already been used, or
to ratchet them forward.

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