updated a bunch of headers
for the new license
diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index 69eb7b9..d7225c4 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ */
+
#ifndef ZSTD_COMPILER_H
#define ZSTD_COMPILER_H