tests: dispatch per lang on the definition of yylex

* tests/local.at (AT_YYLEX_DEFINE): Dispatch on the language.
(AT_YYLEX_DEFINE(java)): New.
* tests/conflicts.at, tests/java.at: Use it.

tests/java.at

@@ -154,14 +154,11 @@ AT_LOCATION_IF([[
     else
       return st.ttype;
   }
-
-
 ]AT_LEXPARAM_IF([[
 };
 %%]], [[
-}]])
+}]])[
 
-[
 class Position {
   public int line;
   public int token;
@@ -198,8 +195,8 @@ class Position {
     return token;
   }
 }
-
 ]])
+
 AT_BISON_OPTION_POPDEFS
 ])# _AT_DATA_JAVA_CALC_Y