patch 8.2.4808: unused item in engine struct

Problem:    Unused item in engine struct.
Solution:   Remove "expr".  Add comment with tags.
diff --git a/src/version.c b/src/version.c
index a2452d3..7ec4c8a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4808,
+/**/
     4807,
 /**/
     4806,