vendor: add github.com/hanwen/go-fuse/v2@master for mount2

vendor/github.com/hanwen/go-fuse/v2/splice/pair_darwin.go

@@ -0,0 +1,22 @@
+// Copyright 2016 the Go-FUSE Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package splice
+
+import ()
+
+func (p *Pair) LoadFromAt(fd uintptr, sz int, off int64) (int, error) {
+	panic("not implemented")
+	return 0, nil
+}
+
+func (p *Pair) LoadFrom(fd uintptr, sz int) (int, error) {
+	panic("not implemented")
+	return 0, nil
+}
+
+func (p *Pair) WriteTo(fd uintptr, n int) (int, error) {
+	panic("not implemented")
+	return 0, nil
+}