patch 8.2.0722: Vim9: not handling constant expression for elseif

Problem:    Vim9: not handling constant expression for elseif.
Solution:   Use postponed constants.  Delete the code for evaluating a
            constant expression.
diff --git a/src/version.c b/src/version.c
index f51f51d..741e3b3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    722,
+/**/
     721,
 /**/
     720,