$OpenBSD$

Fix GCC error: #pragma GCC diagnostic not allowed inside functions
when compiling some extensions.

--- include/ruby/ruby.h.orig	Thu Dec 22 12:58:55 2016
+++ include/ruby/ruby.h	Sat Dec 24 22:25:54 2016
@@ -2192,7 +2192,7 @@ ERRORFUNC(("variable argument length doesn't match"), 
 # define rb_scan_args_verify_count(fmt, varc) \
     ((varc)/(rb_scan_args_count(fmt, varc)))
 
-# ifdef __GNUC__
+# if 0
 # define rb_scan_args_verify(fmt, varc) \
     ({ \
 	int verify; \
