This commit resolves the time overflows in the rgm3800 and mkt3301.

These were causing port problems on systems with 32-bit time.  It turns
out the problem was with the assumption that these devices always
deliver a valid time in $GPRMC.  They don't when the navigation
warning bit (second field 'V') is on!  The NMEA driver now knows.

Also, the code now contains a sanity check - it will log a complaint
if it sees a date moere than a year in the future.  This invariably 
indicates some driver-level problem with time extraction.

1 files changed, 10 insertions, 18 deletions

diff --git a/test/daemon/garmin25lp.log.chk b/test/daemon/garmin25lp.log.chk
index 52ac92e5..2d880d54 100644
--- a/test/daemon/garmin25lp.log.chk
+++ b/test/daemon/garmin25lp.log.chk
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@@ -135,7 +129,6 @@ $GPGSV,3,2,09,15,33,070,39,16,05,184,,18,20,046,,19,73,304,*75
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@@ -144,7 +137,6 @@ $GPGSV,3,2,09,15,33,070,39,16,05,184,,18,20,046,,19,73,304,*75
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