de-support NetBSD 1.6, and note that FreeBSD 4 is on thin ice.

Update notes on required tool versions Note that autoconf 2.59 is the
standard (even though it's old, 2.60 and 2.61 are pretty recent).  For
others, pick releases that are at least 1.5 years old.

Note that GNU awk is required.

Replace update-autotools reference with bootstrap.sh.

(no changelog, doc change only, per GNU coding standards)

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