[patch] Add toplevel configure check for MPFR #2

[Paul Brook]

Attached is a second attempt at adding toplevel configure checks for the MPFR 
library. This adds separate options for GMP and MPFR as it appears these are 
now distributed separately.

Tested on i686-linux with and without gmp and mpfr installed.
Ok?

Paul

2004-07-31  Paul Brook  <paul@codesourcery.com>

	* configure.in: Check for MPFR as well as GMP.
	* configure: Regenerate.
	* gcc/doc/install.texi: Document MPFR requirement.
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