Log Message:
Update to 1.04, provided by Jaap Boender in PR 46805:
This is an upgrade to the latest version. Changes include:
- Added function Zip.add_entry_generator.  (Contributed by A. Frisch.)
- The "level" optional argument was sometimes not honored; fixed.
- Relicensed under LGPL 2.1 or above, with Caml's special exception
  for static linking.

The package itself has been revamped as well, with destdir support, use of
PLIST_VARS, and some more minor improvements. It's also been tested to work
with ocaml 4.00.