Add basic NMEA0183 support as a tty line discipline. The line discipline

decodes NMEA messages completely transparent to userland applications, i.e.
userland can still use the NMEA stream and talk to the device.  If data
is received, a timedelta sensor suitable for ntpd is created.  The timestamp
is not very precise at the moment, use of this is experimental at best.

"get it in or we see how well the swiss people can swim" deraadt@

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