waf: cxx_checks: add copyright notice

Tools/ardupilotwaf/cxx_checks.py

@@ -1,3 +1,17 @@
+# Copyright (C) 2016  Intel Corporation. All rights reserved.
+#
+# This file is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 WAF Tool that checks cxx parameters, creating the ap_config.h
 header file.