FFI cleanups (no underscore assignment)

Hi,

FFI still had underscore assignments in the Unix package
which I fixed now in "FFI-Unix-tbn.3.mcz".


The Metacello configuration is also updated. If you
work with Metacello you can use:

In Squeak:
----------------------------------------------------
Installer
  ss
  project: 'MetacelloRepository';
  install: 'ConfigurationOfFFI'.

  (Smalltalk at: #ConfigurationOfFFI) load
----------------------------------------------------  


In Pharo:
----------------------------------------------------
Gofer new
  squeaksource: 'MetacelloRepository';
  package: 'ConfigurationOfFFI';
  load.

(Smalltalk at: #ConfigurationOfFFI) load
----------------------------------------------------

Have fun
Torsten
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