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.
diff --git a/src/version.c b/src/version.c
index 200779d..a370b3b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1367,
+/**/
     1366,
 /**/
     1365,