spelling fixes; from paul tagliamonte
amendments to his diff are noted on tech

Flense the telnet code base of unwanted ifdefs: authentication/encryption
tn3270, sgtty, pre-POSIX and other ancient system support, etc. Brings up
to date the manpage with what we support.

ok matt

Flense the telnet code base of unwanted ifdefs: authentication/encryption
tn3270, sgtty, pre-POSIX and other ancient system support, etc. Brings up
to date the manpage with what we support.

ok matthieu@ beck@ jmc@ millert@ deraadt@ okan@

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typos from Jonathon Gray;

spelling

From NetBSD: merge of 960317

initial import of NetBSD tree