patch 7.4.1068

Problem:    Wrong way to check for unletting internal variables.
Solution:   Use a better way. (Olaf Dabrunz)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1068,
 /**/
     1067,
 /**/