HEADS UP: First round of autotools changes completed

[Ade Lovett]

With the lil' ol' commit earlier, please note that the following
variables have been put into a de-orbit burn sequence lasting no longer
than June 1st 2004, at which point, attempted use of them will result in
a port getting a helpful BROKEN tag:

	USE_LIBTOOL		(now USE_LIBTOOL_VER=13)
	USE_AUTOCONF		(now USE_AUTOCONF_VER=213)
	USE_AUTOMAKE		(now USE_AUTOMAKE_VER=14)

ie: the version number now has to be explicitly specified.

With the new bsd.autotools.mk around the corner, there will be further
changes across the tree as a lot of things get compressed into a single
USE_AUTOTOOLS variable, allowing combination of build/lib/run
dependencies, configuration, and environmental settings, cleaning up a
large number of hacks currently in the tree.

-aDe (don't be the next person to call me "Mister Autotools"... :)