d: change the return value of yylex from int to TokenKind

* data/skeletons/lalr1.d: Change the return value.
* examples/d/calc/calc.y, examples/d/simple/calc.y: Adjust.
* tests/scanner.at: Adjust.
* tests/calc.at (_AT_DATA_CALC_Y(d)): New, extracted from...
(_AT_DATA_CALC_Y(c)): here.
The two grammars have been sufficiently different to be separated.
Still trying to be them together results in a maintenance burden.  For
the same reason, instead of specifying the results for D and for the
rest, compute the expected results with D from the regular case.

examples/d/calc/calc.y

@@ -114,7 +114,7 @@ class CalcLexer(R) : Lexer
     return semanticVal_;
   }
 
-  int yylex ()
+  TokenKind yylex ()
   {
     import std.uni : isWhite, isNumber;
 

examples/d/simple/calc.y

@@ -109,7 +109,7 @@ class CalcLexer(R) : Lexer
     return semanticVal_;
   }
 
-  int yylex ()
+  TokenKind yylex ()
   {
     import std.uni : isWhite, isNumber;