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/hardlink_unix.go

@@ -1,34 +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 (
-	"os"
-	"syscall"
-)
-
-func getLinkInfo(fi os.FileInfo) (uint64, bool) {
-	s, ok := fi.Sys().(*syscall.Stat_t)
-	if !ok {
-		return 0, false
-	}
-
-	// Ino is uint32 on bsd, uint64 on darwin/linux/solaris
-	return uint64(s.Ino), !fi.IsDir() && s.Nlink > 1 // nolint: unconvert
-}