patch 8.2.4762: using freed memory using synstack() and synID() in WinEnter

Problem:    Using freed memory when using synstack() and synID() in WinEnter.
Solution:   Check using the syntax window. (closes #10204)

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4762,
 /**/
     4761,
 /**/