Bump buildkit to master and fix versions incompatible with go mod 1.13

Bump github.com/gogo/googleapis to v1.3.2
Bump github.com/docker/cli to master

Signed-off-by: Silvin Lubecki <silvin.lubecki@docker.com>

vendor/github.com/containerd/continuity/fs/diff_unix.go

@@ -1,74 +0,0 @@
-// +build !windows
-
-/*
-   Copyright The containerd Authors.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-package fs
-
-import (
-	"bytes"
-	"os"
-	"syscall"
-
-	"github.com/containerd/continuity/sysx"
-	"github.com/pkg/errors"
-)
-
-// detectDirDiff returns diff dir options if a directory could
-// be found in the mount info for upper which is the direct
-// diff with the provided lower directory
-func detectDirDiff(upper, lower string) *diffDirOptions {
-	// TODO: get mount options for upper
-	// TODO: detect AUFS
-	// TODO: detect overlay
-	return nil
-}
-
-// compareSysStat returns whether the stats are equivalent,
-// whether the files are considered the same file, and
-// an error
-func compareSysStat(s1, s2 interface{}) (bool, error) {
-	ls1, ok := s1.(*syscall.Stat_t)
-	if !ok {
-		return false, nil
-	}
-	ls2, ok := s2.(*syscall.Stat_t)
-	if !ok {
-		return false, nil
-	}
-
-	return ls1.Mode == ls2.Mode && ls1.Uid == ls2.Uid && ls1.Gid == ls2.Gid && ls1.Rdev == ls2.Rdev, nil
-}
-
-func compareCapabilities(p1, p2 string) (bool, error) {
-	c1, err := sysx.LGetxattr(p1, "security.capability")
-	if err != nil && err != sysx.ENODATA {
-		return false, errors.Wrapf(err, "failed to get xattr for %s", p1)
-	}
-	c2, err := sysx.LGetxattr(p2, "security.capability")
-	if err != nil && err != sysx.ENODATA {
-		return false, errors.Wrapf(err, "failed to get xattr for %s", p2)
-	}
-	return bytes.Equal(c1, c2), nil
-}
-
-func isLinked(f os.FileInfo) bool {
-	s, ok := f.Sys().(*syscall.Stat_t)
-	if !ok {
-		return false
-	}
-	return !f.IsDir() && s.Nlink > 1
-}