patch 8.0.0316: :help z? does not work

Problem:    ":help z?" does not work. (Pavol Juhas)
Solution:   Remove exception for z?.
diff --git a/src/version.c b/src/version.c
index 7162239..68af6ff 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    316,
+/**/
     315,
 /**/
     314,