Prepend legal announcement in all files.

Release libslang/llvm-rs-cc/llvm-rs-link under Apache 2.0 license.
diff --git a/slangdata.py b/slangdata.py
index d0614f5..2486ff4 100755
--- a/slangdata.py
+++ b/slangdata.py
@@ -1,4 +1,19 @@
 #!/usr/bin/env python
+#
+# Copyright (C) 2010 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
 
 import os, sys