patch 8.2.4747: no filetype override for .sys files

Problem:    No filetype override for .sys files.
Solution:   Add g:filetype_sys. (Patrick Meiser-Knosowski, closes #10181)
diff --git a/src/version.c b/src/version.c
index e3ba0c8..9f99177 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4747,
+/**/
     4746,
 /**/
     4745,