Update libcontainer dependency

vendor/github.com/opencontainers/runc/libcontainer/label/label.go

@@ -21,6 +21,10 @@ func SetProcessLabel(processLabel string) error {
 	return nil
 }
 
+func GetFileLabel(path string) (string, error) {
+	return "", nil
+}
+
 func SetFileLabel(path string, fileLabel string) error {
 	return nil
 }
@@ -48,7 +52,7 @@ func UnreserveLabel(label string) error {
 	return nil
 }
 
-// DupSecOpt takes an process label and returns security options that
+// DupSecOpt takes a process label and returns security options that
 // can be used to set duplicate labels on future container processes
 func DupSecOpt(src string) []string {
 	return nil