Please clarify the license of various boost/thread/detail headers

[jwakely]

These three files:

https://github.com/boostorg/thread/blob/develop/include/boost/thread/detail/invoke.hpp
https://github.com/boostorg/thread/blob/develop/include/boost/thread/detail/invoker.hpp
https://github.com/boostorg/thread/blob/develop/include/boost/thread/detail/make_tuple_indices.hpp

all say:

// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.

However no LICENSE.TXT is present in the repo.

[jwakely]

ping