* configure.in (--with-mpfr-dir, --with-gmp-dir): Remove flags.
	(--with-mpfr-include, --with-mpfr-lib, --with-gmp-include,
	--with-gmp-lib): New flags.

	* configure: Regenerate.

gcc:
	* doc/install.texi: Move GMP/MPFR configure options from Fortran
	section to general section.  Remove documentation for
	--with-mpfr-dir and --with-gmp-dir, add documentation for
	--with-mpfr-include, --with-mpfr-lib, --with-gmp-include and
	--with-gmp-lib.

From-SVN: r119232