Help wanted: configure test for busted mmap

[Nalin Dahyabhai]

On Mon, Jun 24, 2002 at 08:03:13PM -0500, Ben Lindstrom wrote:
> Rejected already.. SysV Shm not an acceptable solution.
> 
> Plus too complex to verify in less than a week.

I'd been wondering about the shm bits.  Still, the non-anonymous mmap()
to a known-good location looks like a reasonable fallback to me.  Hard-
coding the directory used to create the temporary file is probably too
rigid, but I still prefer doing something like this to a configure check.

Cheers,

Nalin