patch 8.2.1501: Vim9: concatenating to constant reverses order

Problem:    Vim9: concatenating to constant reverses order.
Solution:   Generate constant before option, register and environment
            variable. (closes #6757)
diff --git a/src/version.c b/src/version.c
index bd836e0..4e7b9ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1501,
+/**/
     1500,
 /**/
     1499,