[Toybox] RFC: another stab at date.c.

[Rob Landley]

There was a thread back in January where I tried to figure out why %s
wasn't working in date -D, which resulted in me being mad at mktime and
strptime for being stupidly designed, petering out around here:

http://lists.landley.net/pipermail/toybox-landley.net/2017-January/008829.html

Along the way, a problem I hit (repeatedly) was that chkmktime() is
really brittle, most recently that timezones can drive it nuts.

Here's the patch I have lying around to remove chkmktime and instead
just check the posix boundaries required by
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/time.h.html but
I dunno if that fixes Elliott's original reasons for adding chkmktime in
the first place.

Opinions?

Rob
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