Update to tzcode2007a. This adds support for 64bit time_t in case

we need it in the future.  All of our platforms currently have 32bit
time_t types.  This also extends the timezone data file format to
support both 32bit and 64bit data.  The 64bit data is located after
the 32bit data so binaries linked with the older tzcode simply won't
look at it.  A version field in the file header is used to determine
whether the data file is the old or extended format.  OK miod@

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