vendor: update buildkit to 539be170

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/containerd/containerd/defaults/defaults_darwin.go

@@ -0,0 +1,37 @@
+/*
+   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 defaults
+
+const (
+	// DefaultRootDir is the default location used by containerd to store
+	// persistent data
+	DefaultRootDir = "/var/lib/containerd"
+	// DefaultStateDir is the default location used by containerd to store
+	// transient data
+	DefaultStateDir = "/var/run/containerd"
+	// DefaultAddress is the default unix socket address
+	DefaultAddress = "/var/run/containerd/containerd.sock"
+	// DefaultDebugAddress is the default unix socket address for pprof data
+	DefaultDebugAddress = "/var/run/containerd/debug.sock"
+	// DefaultFIFODir is the default location used by client-side cio library
+	// to store FIFOs.
+	DefaultFIFODir = "/var/run/containerd/fifo"
+	// DefaultRuntime would be a multiple of choices, thus empty
+	DefaultRuntime = ""
+	// DefaultConfigDir is the default location for config files.
+	DefaultConfigDir = "/etc/containerd"
+)

vendor/github.com/containerd/containerd/defaults/defaults_unix.go

@@ -1,4 +1,5 @@
-// +build !windows
+//go:build !windows && !darwin
+// +build !windows,!darwin
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/containerd/defaults/defaults_windows.go

@@ -1,5 +1,3 @@
-// +build windows
-
 /*
    Copyright The containerd Authors.