unarr: Update LZMA SDK
Using lzma2102.7z from: https://sourceforge.net/projects/sevenzip/files/LZMA%20SDK/
And adapt RAR decoder for changes in C API.
Using lzma2102.7z from: https://sourceforge.net/projects/sevenzip/files/LZMA%20SDK/
And adapt RAR decoder for changes in C API.