patch 8.1.0323: reverse order of VTP calls only needed the first time

Problem:    Reverse order of VTP calls only needed the first time.
Solution:   Add a flag to remember the state. (Nobuhiro Takasaki, closes #3366)

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    323,
 /**/
     322,
 /**/