[configury patch] don't add 'mpfr' to --with-mpfr-dir

[Paul Brook]

> 2005-06-04  Tobias Schl"uter  <tobias.schlueter@physik.uni-muenchen.de>
>
> 	* configure.in: Don't add another '/mpfr' to the directory given
> 	in --with-mpfr-dir.
> 	* configure: Regenerate.

Ok.

This looks like is a copy/paste error from when we assumed a combined gmp+mpfr 
build.

Paul