patch 9.1.0168: too many STRLEN() calls

Problem:  too many STRLEN() calls
Solution: Make use of ml_get_len() calls instead
          (John Marriott)

closes: #14123

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    168,
 /**/
     167,
 /**/