patch 8.2.2918: builtin function can be shadowed by global variable

Problem:    Builtin function can be shadowed by global variable.
Solution:   Check for builtin function before variable. (Yasuhiro Matsumoto,
            closes #8302)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2918,
 /**/
     2917,
 /**/