patch 8.1.0493: argv() and argc() only work on the current argument list

Problem:    argv() and argc() only work on the current argument list.
Solution:   Add a window ID argument. (Yegappan Lakshmanan, closes #832)

src/version.c

@@ -792,6 +792,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    493,
 /**/
     492,
 /**/