dlang: initial changes to run the calc tests on it

* configure.ac (DCFLAGS): Define.
* tests/atlocal.in: Receive it.
* data/skeletons/d.m4 (api.parser.class): Remove spurious YY.
* data/skeletons/lalr1.d (yylex): Return an int instead of a
YYTokenType, so that we can use characters as tokens.
* examples/d/calc.y: Adjust.
* tests/local.at: Initial support for D.
(AT_D_IF, AT_DATA_GRAMMAR(D), AT_YYERROR_DECLARE(d))
(AT_YYERROR_DECLARE_EXTERN(d), AT_YYERROR_DEFINE(d))
(AT_MAIN_DEFINE(d), AT_COMPILE_D, AT_LANG_COMPILE(d), AT_LANG_EXT(d)):
New.
* tests/calc.at: Initial support for D.
* tests/headers.at

tests/atlocal.in

@@ -118,6 +118,9 @@ fi
 ## Other.  ##
 ## ------- ##
 
+: ${DC='@DC@'}
+: ${DCFLAGS='@DCFLAGS@'}
+
 # Empty if no javac was found
 : ${CONF_JAVAC='@CONF_JAVAC@'}