Ask in a comment whether we should test HAVE_STRUCT_STAT_ST_BLKSIZE.

We're defining it now based on whether there's an st_blksize member of
struct stat.  We're currently testing _STATBUF_ST_BLKSIZE, but that's
not guaranteed to be defined on platforms that have an st_blksize member
of struct stat (it's not defined on macOS, for example).

Change-Id: I4e6011a7668da94cf1ca6328e29c50924dd1d8b0
Reviewed-on: https://code.wireshark.org/review/32381
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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