patch 8.2.1698: cannot lock a variable in legacy Vim script like in Vim9

Problem:    Cannot lock a variable in legacy Vim script like in Vim9.
Solution:   Make ":lockvar 0" work.
diff --git a/src/version.c b/src/version.c
index 4418790..ea9a50a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1698,
+/**/
     1697,
 /**/
     1696,