Improve use of &deprecated on functions.

- Don't report warnings on function definition if declaration is marked
  deprecated.
- Allow &deprecated to apply to a standalone function definition.

src/Var.cc

@@ -435,6 +435,10 @@ void end_func(Stmt* body, attr_list* attrs)
 		loop_over_list(*attrs, i)
 			{
 			Attr* a = (*attrs)[i];
+
+			if ( a->Tag() == ATTR_DEPRECATED )
+				continue;
+
 			if ( a->Tag() != ATTR_PRIORITY )
 				{
 				a->Error("illegal attribute for function body");