Add support for parsing C++11 final classes

Such as:

  class X final {};

This no longer gives a syntax error.
This change has introduced one more shift-reduce conflict in the parser.
with a conflict with a C style variable declaration with name final:

  class X final;

resulting in a syntax error (for C++ not C). This is an an unusual style
for C++ code and more typical declarations do work:

  X final;

Closes #672

CHANGES.current

@@ -7,6 +7,13 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2022-10-05: olly, wsfulton
+            #672 Add support for parsing C++11 final classes such as:
+
+              class X final {};
+
+            This no longer gives a syntax error.
+
 2022-10-05: wsfulton
             [OCaml] Fix %rename for enum items. Previously the rename had no effect.