and EINTR, so do it, more or less from bgpd

From Solar Designer based on changes in FreeBSD.  OK deraadt@

From: Thomas Jarosch <thomas.jarosch@intra2net.com>

Kill old files that are no longer compiled.
okay theo

Make sure tolower/toupper use the whole 8 bits.
okay deraadt@
thanks to everyone who tested

relevant anyway;
ok jaredy@

- avoid first person.
ok jmc

okay deraadt@, millert@, krw@

from netbsd pr #30872 (anonymous post);
ok deraadt@ krw@

November of that year; however, the corresponding man changes were
never backed out.
do that now, reversing -r1.3 of this file;
original pr and diff from peter philipp (this commit closes pr #4309);
i chose to revert -r1.3 rather than accept the new wording from peter;
thanks jaredy@ for tracking all this down, and supplying the ok...

- break long lines
ok jmc

- use `$' for command prompts
- clean up: use a bullet list instead of adding junk to denote list
items
ok jmc

graceful shutdown work correctly.
ok mpf@ deraadt@ a long time ago, committed to local repository by accident.

ok deraadt@

ok deraadt@

with way less data

mode, noticed by kettenis

why this was rotting in my tree for so long, I dunno - and I dunno where it
came from

ok henning@

Prodded by art@ and fgsch@, ok deraadt@

replies.  ok henning@

uptodate, namely, wcsto(u)l(l) family, wcstod, stubs from wctrans/towctrans
crank minor.
okay millert@, jmc@.

code would dereference NULL for mixed letter and number args.
OK deraadt@

prompted by deraadt@ and henning@, ok marco@

do it's job it would have to choose between two cases:
1. either it would take a very long time to get the correct adjustment, thus,
if you are not currently on the net right, you wait a long time (or must
type ^C, which is ridiculous)
2. ntpd could be modified to "abort early", but then would not meet the
promise made by -s in the manual page (note: it does not say that it
"tries")
therefore, -s and -S must become user choices.  Sorry.  This same choice is
made in lots of other places