[MiNT] NTP client ported to MiNT

[Martin-Éric Racine <q-funk@pp.fishpool.fi>]

Just uploaded to Frank's server, Funet and lip6: my port of K9, a
very simple NTP client. This allows for easy synchronisation with
any server that sends NTP broadcasts.

Because NTP works in UTC and alters the RTC time, one must also
run their MiNT setup in UTC mode (see tzinit manual). 

Sadly, this puts MiNT behind Linux, in terms of flexibility:

Linux can run in RTC=localtime and still use NTP, while MiNT does
not currently know how to offset from UTC back to localtime, at
the application level. 

-- 
Martin-Éric Racine  http://funkyware.atari.org/  Atari TT030 FAQ
Lappeenranta, Finland.  Surfing on a Intel/Microsoft-free GEM OS