Minor configure item and Fedora 9

[Michael D. Godfrey]

>
> In that case, we could simply issue a message like
> >
> >  configure: no BLAS library installed; falling back on reference
> >             sources distributed with Octave
> >
> > and later:
> >
> >  configure: skipping CHOLMOD test because BLAS library is not installed
> >
> > but then I suspect that would still confuse some people...
> >
> > jwe
I think that either of these would be an improvement, and probably good
enough.  My problem was that I spent time trying to figure out why Octave
could not find CHOLMOD, which was installed. So, if BLAS appears anywhere
in the message, I would have remembered that I had not yet installed it.

Thanks for worrying about this.  Just a simple change like the above should
be fine.

Michael