pacman-optimize: standardize on openssl usage, only touch local/

The rest of our scripts have been using `openssl dgst` rather than tools
like `md5sum` for some time, so convert this one too. We also make the
following other adjustments:

* Use a `find -print0 | xargs -0` pipeline so paths with spaces and or
  newlines don't totally kill us.
* Ensure the files we write out contain only paths relative to the
  database root, where we know the filenames should all be sane.
* Remove use of `diff`, this was the only time we used it in scripts and
  we can get a cheap substitute by comparing file checksums instead.
* Only touch the local/ part of the database. It makes little sense to
  do anything to the sync/ directory anymore as they are compressed
  single files that should be regularly written out in full and won't be
  fragmented on any sane filesystem.

Signed-off-by: Dan McGee <dan@archlinux.org>

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