Log Message:
Update to ECL 9.8.3.

Changes since previous packaged version (8.12.0) include half year
of very active development:

- The dynamic FFI is now implemented using libffi.

- Support of UNICODE.

- Multithreading (provided Boehm-GC built with threads support).

- Command line flags to control the different memory limits:
  --heap-size, --lisp-stack, --frame-stack and --c-stack.

- The stack size is now measured in bytes, not in lisp words.

- The out of memory error (ext:storage-exhausted) can now be recovered.
  By default a correctable error is signaled and the user is given the
  chance to increase the heap size.

- Better compiler, optimizer, debugger.

- Improved handling of compiler errors.

- New and more easily extensible implementation of streams.

- *STANDARD-INPUT*, *{STANDARD,ERROR,TRACE}-OUTPUT* are no longer synonyms to
  *TERMINAL-IO* but directly the input or output streams associated to stdin,
  stdout and stderr.

- Improved numerics.

- Read-only readtables.

- Numerous bug fixes.