vendor: Add dependencies for discosrv

vendor/github.com/cznic/fileutil/fileutil_freebsd.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2014 The fileutil Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !arm
+
+package fileutil
+
+import (
+	"io"
+	"os"
+)
+
+// PunchHole deallocates space inside a file in the byte range starting at
+// offset and continuing for len bytes. Unimplemented on FreeBSD.
+func PunchHole(f *os.File, off, len int64) error {
+	return nil
+}
+
+// Fadvise predeclares an access pattern for file data.  See also 'man 2
+// posix_fadvise'. Unimplemented on FreeBSD.
+func Fadvise(f *os.File, off, len int64, advice FadviseAdvice) error {
+	return nil
+}
+
+// IsEOF reports whether err is an EOF condition.
+func IsEOF(err error) bool { return err == io.EOF }