patch 8.2.1643: Vim9: :defcompile compiles dead functions

Problem:    Vim9: :defcompile compiles dead functions.
Solution:   Skip over dead functions.
diff --git a/src/version.c b/src/version.c
index 54bb128..18d2b3e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1643,
+/**/
     1642,
 /**/
     1641,