patch 8.0.1573: getwinpos(1) may cause response to be handled as command

Problem:    getwinpos(1) may cause response to be handled as command.
Solution:   Handle any cursor position report once one was request. (partly by
            Hirohito Higashi)

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1573,
 /**/
     1572,
 /**/