Added support for Haystack tracing

vendor/golang.org/x/sys/unix/flock.go

@@ -1,22 +0,0 @@
-// Copyright 2014 The Go 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 darwin dragonfly freebsd linux netbsd openbsd
-
-package unix
-
-import "unsafe"
-
-// fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
-// systems by flock_linux_32bit.go to be SYS_FCNTL64.
-var fcntl64Syscall uintptr = SYS_FCNTL
-
-// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
-func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
-	_, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
-	if errno == 0 {
-		return nil
-	}
-	return errno
-}