Release llvm_patches and libunwind_patches into the public domain so they can...

Release llvm_patches and libunwind_patches into the public domain so they can be incorporated into the upstream projects and their users

LICENSE

+Unless otherwise specified (see below), the contents of this repository
+are released under the following license:
+
+
 Copyright (c) 2014 Dropbox, Inc.
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -11,3 +15,12 @@ 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.
+
+
+
+Exceptions:
+- The contents of libunwind_patches and llvm_patches are released
+  into the public domain, though the same disclaimer applies:
+    Unless required by applicable law or agreed to in writing, software
+    distributed is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.