style: formatting clean up

* data/skeletons/d.m4, examples/d/calc.y, src/output.c,
* src/parse-gram.y:
No tab, no trailing spaces.
Reported by syntax-check.

examples/d/calc.y

@@ -156,4 +156,3 @@ void main ()
   Calc p = new Calc (l);
   p.parse ();
 }
-