This adds a `-x`/`--verbose-hex` option to `cmp`, similar to what FreeBSD has in
its own `cmp`. From `doc/diffutils.texi`:

'-x'
'--verbose-hex'
     Like '--verbose', but with hexadecimal numbers, and byte numbers
     starting at 0.

A few assorted points: ...

I was looking for the `-x` option today and saw it was still unimplemented 5 years after this patch. What is the proper channel to submit pull requests to this project?