patch 9.0.1586: error for using two messages with ngettext() differing in "%"

Problem:    Checking translations gives an error for using two messages with
            ngettext() that differ in "%" items.
Solution:   Adjust the check script to tolerate omitting one "%" item.

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1586,
 /**/
     1585,
 /**/