Proposed rework of autotools call structure from port Makefiles

[Ade Lovett]

Hi all,

I'm currently working on something of a rewrite to the way in which
ports/ Makefiles will make use of the build-time autotools (libtool,
autoconf, automake, and friends).

The short document is available as:

	http://people.FreeBSD.org/~ade/autotools.html

If y'all could look over this, particularly if you're a maintainer who
makes heavy use of autotools (that means you, GNOME folks :), and
provide feedback, I'd really appreciate it.

Thanks,
	-aDe