Use _snprintf for snprinf in Microsoft C.

More than a decade later, Microsoft C does not support the C99
standard.  It's good that _snprintf has a different name, since it
does not guarantee that the result is null terminated, as does
snprintf.  However where _snprintf is used under Microsoft C, the
destination string is assured to be long enough, so this will not
be a problem.  This occurs in two places, both in gzlib.c.  Where
sprintf functionality is needed by gzprintf, vsnprintf is used in
the case of Microsoft C.

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