Add libcxxabi's LICENSE.TXT to libunwind.
When libunwind was spinned off libcxxabi, most file were copied from
libcxxabi to libunwind. However, libc++abi's toplevel LICENSE.TXT was
forgotten in the copying. It's considered a good practice to have the
license file at the root of the project, and making linunwind a separate
project was not supposed to change its licensing. Besides, several
header files refer to the LICENSE.TXT, so copy the one from libc++abi.
git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@296358 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed
