Add copyrights to some devtools

contrib/devtools/security-check.py

@@ -1,4 +1,7 @@
 #!/usr/bin/env python
+# Copyright (c) 2016-2022 The Hush developers
+# Distributed under the GPLv3 software license, see the accompanying
+# file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 '''
 Perform basic ELF security checks on a series of executables.
 Exit status will be 0 if successful, and the program will be silent.

contrib/devtools/symbol-check.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # Copyright (c) 2014 Wladimir J. van der Laan
+# Copyright (c) 2016-2022 The Hush developers
 # Distributed under the GPLv3 software license, see the accompanying
 # file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 '''