patch 9.0.0405: arguments in a partial not used by a :def function

Problem:    Arguments in a partial not used by a :def function.
Solution:   Put the partial arguments on the stack.

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    405,
 /**/
     404,
 /**/