Update gennews for GCC 12.

2022-05-06  Jakub Jelinek  <jakub@redhat.com>

	* gennews (files): Add files for GCC 12.

(cherry picked from commit 8025f29fbd8f87e27354b69d0bc9eb8d1aeae94c)
diff --git a/contrib/gennews b/contrib/gennews
index cd773cd..635a79b 100755
--- a/contrib/gennews
+++ b/contrib/gennews
@@ -3,7 +3,7 @@
 # Script to generate the NEWS file from online release notes.
 # Contributed by Joseph Myers <jsm28@cam.ac.uk>.
 #
-# Copyright (C) 2000-2021 Free Software Foundation, Inc.
+# Copyright (C) 2000-2022 Free Software Foundation, Inc.
 # This file is part of GCC.
 #
 # GCC is free software; you can redistribute it and/or modify
@@ -23,6 +23,7 @@
 
 website=http://gcc.gnu.org/
 files="
+    gcc-12/index.html gcc-12/changes.html
     gcc-11/index.html gcc-11/changes.html
     gcc-10/index.html gcc-10/changes.html
     gcc-9/index.html gcc-9/changes.html