patch 9.0.1367: divide by zero in zero-width window

Problem:    Divide by zero in zero-width window.
Solution:   Check the width is positive.

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1367,
 /**/
     1366,
 /**/