Utmpx usage

[Chris Rees]

Hi all,

After removing all kittens from Ed's reach, I'm disclosing that
sysutils/runit tried to use utmpx to directly read() and write() the
utmpx files directly...

I've replaced the offending code with a patch to the port [1], but I
wonder if anyone would please review the patch? I don't have a CURRENT
machine to try it on... I may have also made some terrible mistakes --
I'm not hugely familiar with utmpx.

Thanks!

Chris

[1] http://www.bayofrum.net/~crees/patches/runit-utmpx.patch