Calculate node header hash from a separate variableHEADmain

Really just to avoid passing a buffer smaller than 64 bits to zix_digest().
Although that's safe (it doesn't read beyond the provided size), this is beyond
some static analysis tools.  So, avoid false positives by first copying the
relevant header to a size_t variable making it statically obvious that (on
64-bit) 8 bytes of memory are available for reading.

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