Merge all upstream changes

norlimit.go

@@ -0,0 +1,10 @@
+// Copyright 2021 The Sqlite Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build windows
+// +build windows
+
+package sqlite // import "modernc.org/sqlite"
+
+func setMaxOpenFiles(n int) error { return nil }