bump opencontainers/selinux v1.2.1

full diff: opencontainers/selinux@v1.2...v1.2.1

brings in opencontainers/selinux#49 Ignore attempts to setLabels "" on SELinux disabled systems

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

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

@@ -333,6 +333,11 @@ func writeCon(fpath string, val string) error {
 	if fpath == "" {
 		return ErrEmptyPath
 	}
+	if val == "" {
+		if !GetEnabled() {
+			return nil
+		}
+	}
 
 	out, err := os.OpenFile(fpath, os.O_WRONLY, 0)
 	if err != nil {