on windows, missing file for lldb

[indynov]

Missing python36.dll in \LLVM\bin for lldb to work.

Can find the file at https://www.python.org/downloads/release/python-360/ in the embeddable zip file such as for x64 https://www.python.org/ftp/python/3.6.0/python-3.6.0-embed-amd64.zip and put in \LLVM\bin along with lldb.exe for it to work

[llvmbot]

@llvm/issue-subscribers-lldb