patch 8.0.0040

Problem:    Whole line highlighting with matchaddpos() does not work.
Solution:   Check for zero length. (Hirohito Higashi)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    40,
 /**/
     39,
 /**/