Prefer CALLN

* src/bytecode.c (Fbyte_code):
* src/composite.c (Fclear_composition_cache):
Prefer CALLN to doing it by hand.
* src/fns.c (ccall2): Remove.  All uses replaced by CALLN.

src/bytecode.c

@@ -325,8 +325,8 @@ If the third argument is incorrect, Emacs may crash.  */)
 	 the original unibyte form.  */
       bytestr = Fstring_as_unibyte (bytestr);
     }
-  Lisp_Object args[] = {0, bytestr, vector, maxdepth};
-  return exec_byte_code (Fmake_byte_code (4, args), 0, 0, NULL);
+  Lisp_Object fun = CALLN (Fmake_byte_code, 0, bytestr, vector, maxdepth);
+  return exec_byte_code (fun, 0, 0, NULL);
 }
 
 static void