[Ecls-list] FFI patch

[Goffioul Michael]

Hi,

Attached is a patch that complete and fixes the FFI support in ECL.
Now, a lot of UFFI tests/examples also works under ECL. The patch
includes (non exhaustive):

- use make_integer instead of MAKE_FIXNUM to convert array element
- use :pointer-void instead of :object for '(* type) LISP type
  in FFI functions
- add explicit recast on FFI object when required
- add ecl_cstring_to_string_or_nil() function to cover the case
  when char* object is NULL

Attached is also a test file that covers many FFI features. A large
part of the tests is directly taken from UFFI.

Michael.
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