Announce: MPFR 2.2.1 is released

[DJ Delorie]

Joe Buck <Joe.Buck@synopsys.COM> writes:
> The ordinary user who builds gcc from source does not need *any*
> version of automake, autoconf, etc., so any strict requirements that
> are imposed on these tools have an impact only on gcc developers.

I wish we could have similar requirements for GMP and MPFR, rather
than requiring the user to pre-install them on pretty much EVERY
computer.