updated for version 7.4.511

Problem:    Generating proto for if_ruby.c uses type not defined elsewhere.
Solution:   Do not generate a prototype for
            rb_gc_writebarrier_unprotect_promoted()

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    511,
 /**/
     510,
 /**/