vendor: update buildkit with typed errors support

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

vendor/github.com/moby/buildkit/solver/errdefs/vertex.go

@@ -0,0 +1,36 @@
+package errdefs
+
+import (
+	"github.com/containerd/typeurl"
+	"github.com/moby/buildkit/util/grpcerrors"
+	digest "github.com/opencontainers/go-digest"
+)
+
+func init() {
+	typeurl.Register((*Vertex)(nil), "github.com/moby/buildkit", "errdefs.Vertex+json")
+	typeurl.Register((*Source)(nil), "github.com/moby/buildkit", "errdefs.Source+json")
+}
+
+type VertexError struct {
+	Vertex
+	error
+}
+
+func (e *VertexError) Unwrap() error {
+	return e.error
+}
+
+func (e *VertexError) ToProto() grpcerrors.TypedErrorProto {
+	return &e.Vertex
+}
+
+func WrapVertex(err error, dgst digest.Digest) error {
+	if err == nil {
+		return nil
+	}
+	return &VertexError{Vertex: Vertex{Digest: dgst.String()}, error: err}
+}
+
+func (v *Vertex) WrapError(err error) error {
+	return &VertexError{error: err, Vertex: *v}
+}