[RFC] Update to current automake/autoconf/libtool versions.

[Ben Elliston]

>>>>> "Klee" == Klee Dienes <klee@apple.com> writes:

  Klee> The idea here is that it's relatively straightforward for a
  Klee> binutils/gdb maintainer to know what to do when updating a
  Klee> configuration file (get the most recent version of the tools
  Klee> from the FSF and use them), and that we have a natural
  Klee> tendency to stay up-to-date with automake/autoconf changes,
  Klee> without having flag-day style upgrades become an issue.

The flag day has less to do with the binutils and GCC development
process and more to do with Autoconf development.  Some poor decisions
have been made there recently with respect to backward compatibility.

Ben