inndstart security model fix

[Russ Allbery]

Russ Allbery <rra at Stanford.EDU> writes:

> Rewrite finished and tested, so if anyone objects, yell now.  Otherwise,
> I'm going to check it in.

Hearing no objections, rewrite of inndstart is now in.  Built and tested
on Solaris, yell if I broke anything.  Note that it uses setreuid(); we'll
find out if there are any platforms that don't have that.

-- 
Russ Allbery (rra at stanford.edu)         <URL:http://www.eyrie.org/~eagle/>