patch 8.1.0168: output of :marks is too short with multi-byte chars

Problem:    Output of :marks is too short with multi-byte chars. (Tony
            Mechelynck)
Solution:   Get more bytes from the text line.

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    168,
 /**/
     167,
 /**/