temp file creation problem in inn

[Alan Cox]

> Thanks, I'll take a look.  Note that one problem is that INN uses a large
> number of shell scripts, and safe temporary file creation in shell scripts
> is a non-trivial problem.

The openbsd folks added a mktemp utility to address this and make the safer
tmp file handling available beyond C.  AFAIK its under a generic BSD license
so could be shipped with INN