patch 8.2.4047: depending on the build features error messages are unused

Problem:    Depending on the build features error messages are unused.
Solution:   Add #ifdefs. (Dominique Pellé, closes #9493)
diff --git a/src/version.c b/src/version.c
index f2845e2..f337963 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4047,
+/**/
     4046,
 /**/
     4045,