patch 8.2.2580: Vim9: checking vararg type may be wrong

Problem:    Vim9: checking vararg type is wrong when function is auto-loaded.
Solution:   Use the member type. (closes #7933)
diff --git a/src/version.c b/src/version.c
index 4a4d65a..f3c79c8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2580,
+/**/
     2579,
 /**/
     2578,