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

[Joern Rennecke]

> It seems that the major impact of configuring parts of a tree using
> different autoconf versions will be on people using
> --enable-maintainer-mode, so another solution might be to extend
> --enable-maintainer-mode to accept a list of directories.  I suspect
> most developers will only want --enable-maintainer-mode in the
> particular area they work on.

Unfortunately, for CPU port maintainers the area they work on is a
cross-section of gcc, newlib, binutils and gdb.

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