patch 8.2.4808: unused item in engine struct

Problem:    Unused item in engine struct.
Solution:   Remove "expr".  Add comment with tags.

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4808,
 /**/
     4807,
 /**/