c++: get rid of symbol_type::token ()

It is not used.  And its implementation was wrong when api.token.raw
was defined, as it was still mapping to the external token numbers,
instead of the internal ones.  Besides it was provided only when
api.token.constructor is defined, yet always declared.

* data/skeletons/c++.m4 (by_type::token): Remove, useless.

TODO

@@ -135,9 +135,7 @@ $ ./tests/testsuite -l | grep errors | sed q
 
 * Short term
 ** Get rid of YYPRINT and b4_toknum
-
-** C++ a closer look at parser::by_type::token
-It can certainly be simplified with we use api.token.raw.
+Besides yytoknum is wrong when api.token.raw is defined.
 
 ** Stop indentation in diagnostics
 Before Bison 2.7, we printed "flatly" the dependencies in long diagnostics:

data/skeletons/c++.m4

@@ -367,9 +367,6 @@ m4_define([b4_symbol_type_define],
       /// \a empty when empty.
       symbol_number_type type_get () const YY_NOEXCEPT;
 
-      /// The token.
-      token_type token () const YY_NOEXCEPT;
-
       /// The symbol type.
       /// \a empty_symbol when empty.
       /// An int, not token_number_type, to be able to store empty_symbol.
@@ -498,22 +495,7 @@ m4_define([b4_public_types_define],
   {
     return type;
   }
-]b4_token_ctor_if([[
-  ]b4_inline([$1])b4_parser_class[::token_type
-  ]b4_parser_class[::by_type::token () const YY_NOEXCEPT
-  {
-    // YYTOKNUM[NUM] -- (External) token number corresponding to the
-    // (internal) symbol number NUM (which must be that of a token).  */
-    static
-    const ]b4_int_type_for([b4_toknum])[
-    yytoken_number_[] =
-    {
-  ]b4_toknum[
-    };
-    return token_type (yytoken_number_[type]);
-  }
-]])[]dnl
-])
+]])
 
 
 # b4_token_constructor_define