pick up fix for CVE-2019-19921 in opencontainers/selinux

opencontainers/selinux/issues/61 has a request for a new release

Here's the full diff:
3a1f366feb...5215b1806f

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go

@@ -96,6 +96,14 @@ func SetExecLabel(label string) error {
 	return nil
 }
 
+/*
+SetTaskLabel sets the SELinux label for the current thread, or an error.
+This requires the dyntransition permission.
+*/
+func SetTaskLabel(label string) error {
+        return nil
+}
+
 /*
 SetSocketLabel sets the SELinux label that the kernel will use for any programs
 that are executed by the current process thread, or an error.
@@ -109,6 +117,11 @@ func SocketLabel() (string, error) {
 	return "", nil
 }
 
+// PeerLabel retrieves the label of the client on the other side of a socket
+func PeerLabel(fd uintptr) (string, error) {
+	return "", nil
+}
+
 // SetKeyLabel takes a process label and tells the kernel to assign the
 // label to the next kernel keyring that gets created
 func SetKeyLabel(label string) error {