Disable CFFI Common Lisp target language

Clean up to disable target languages that have been neglected/not functional.
Target language be fully deleted in SWIG 4.1 unless a new maintainer brings
it up to an acceptable status (experimental or supported).

Issue #1447

Doc/Manual/Preprocessor.html

@@ -109,7 +109,6 @@ SWIGIMPORTED                    Defined when SWIG is importing a file with <tt>%
 SWIG_VERSION                    Hexadecimal (binary-coded decimal) number containing SWIG version,
                                 such as 0x010311 (corresponding to SWIG-1.3.11).
 
-SWIGCFFI                        Defined when using CFFI
 SWIGCSHARP                      Defined when using C#
 SWIGGUILE                       Defined when using Guile
 SWIGJAVA                        Defined when using Java

Doc/Manual/SWIG.html

@@ -118,7 +118,6 @@ for example, <tt>swig -ruby -help</tt> for Ruby.
 
 <div class="shell"><pre>
 Supported Target Language Options
-     -cffi           - Generate CFFI wrappers
      -csharp         - Generate C# wrappers
      -d              - Generate D wrappers
      -go             - Generate Go wrappers

Doc/Manual/Sections.html

@@ -46,7 +46,6 @@ Last update : SWIG-4.0.0 (in progress)
 <li><a href="Guile.html#Guile">Guile support</a></li>
 <li><a href="Java.html#Java">Java support</a></li>
 <li><a href="Javascript.html#Javascript">Javascript support</a></li>
-<li><a href="Lisp.html#Lisp">Common Lisp support</a></li>
 <li><a href="Lua.html#Lua">Lua support</a></li>
 <li><a href="Mzscheme.html#Mzscheme">MzScheme/Racket support</a></li>
 <li><a href="Ocaml.html#Ocaml">Ocaml support</a></li>

Doc/Manual/chapters

@@ -24,7 +24,6 @@ Go.html
 Guile.html
 Java.html
 Javascript.html
-Lisp.html
 Lua.html
 Mzscheme.html
 Ocaml.html