etc: add missing license boilerplates

src/etc/unicode.py

@@ -1,5 +1,14 @@
 #!/usr/bin/env python
-# xfail-license
+#
+# Copyright 2011-2013 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
 
 # This digests UnicodeData.txt and DerivedCoreProperties.txt and emits rust
 # code covering the core properties. Since this is a pretty rare event we