patch 8.2.4751: mapping <SID>name.Func does not work for autoload script

Problem:    Mapping <SID>name.Func does not work for script in autoload
            directory.
Solution:   Use the # form for a script in the autoload directory.
            (closes #10186)

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4751,
 /**/
     4750,
 /**/