TUN-1615: revert miekg/dns to last known working revision

The last known good commit is 6da3249dfb57fbaa16efafcd8744cee8809d80cd before the first release tag.

vendor/golang.org/x/net/bpf/asm.go

@@ -1,41 +0,0 @@
-// Copyright 2016 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.
-
-package bpf
-
-import "fmt"
-
-// Assemble converts insts into raw instructions suitable for loading
-// into a BPF virtual machine.
-//
-// Currently, no optimization is attempted, the assembled program flow
-// is exactly as provided.
-func Assemble(insts []Instruction) ([]RawInstruction, error) {
-	ret := make([]RawInstruction, len(insts))
-	var err error
-	for i, inst := range insts {
-		ret[i], err = inst.Assemble()
-		if err != nil {
-			return nil, fmt.Errorf("assembling instruction %d: %s", i+1, err)
-		}
-	}
-	return ret, nil
-}
-
-// Disassemble attempts to parse raw back into
-// Instructions. Unrecognized RawInstructions are assumed to be an
-// extension not implemented by this package, and are passed through
-// unchanged to the output. The allDecoded value reports whether insts
-// contains no RawInstructions.
-func Disassemble(raw []RawInstruction) (insts []Instruction, allDecoded bool) {
-	insts = make([]Instruction, len(raw))
-	allDecoded = true
-	for i, r := range raw {
-		insts[i] = r.Disassemble()
-		if _, ok := insts[i].(RawInstruction); ok {
-			allDecoded = false
-		}
-	}
-	return insts, allDecoded
-}