patch 9.0.0476: varargs does not work for replacement function of substitute()

Problem:    Varargs does not work for replacement function of substitute().
Solution:   Check the varargs flag of the function. (closes #11142)
diff --git a/src/version.c b/src/version.c
index ae74081..77db155 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    476,
+/**/
     475,
 /**/
     474,