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.go

@@ -1,43 +0,0 @@
-/*
-   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"
-
-// GetLinkInfo returns an identifier representing the node a hardlink is pointing
-// to. If the file is not hard linked then 0 will be returned.
-func GetLinkInfo(fi os.FileInfo) (uint64, bool) {
-	return getLinkInfo(fi)
-}
-
-// getLinkSource returns a path for the given name and
-// file info to its link source in the provided inode
-// map. If the given file name is not in the map and
-// has other links, it is added to the inode map
-// to be a source for other link locations.
-func getLinkSource(name string, fi os.FileInfo, inodes map[uint64]string) (string, error) {
-	inode, isHardlink := getLinkInfo(fi)
-	if !isHardlink {
-		return "", nil
-	}
-
-	path, ok := inodes[inode]
-	if !ok {
-		inodes[inode] = name
-	}
-	return path, nil
-}