bump Autoconf and Libtool versions?

[Ralf Wildenhues]

Hi Paolo, all,

any plans to bump Autoconf and Libtool versions used in GCC?
I'd like to see 2.68 and 2.4.0 in 4.6 in due course of course
(i.e., after both have been released, and before stage 1 ends).

Should I proposed patches then?

Thanks,
Ralf