Verify LLDB python version

[adam-fowler]

Verify version of python in the path is the same version of python that liblldb was built against. Can use llvm-readobj to do this.

This is a request for Windows but may also be a valid request on other platforms.

[adam-fowler]

@compnerd I haven't checked Windows but llvm-readobj is not part of the standard swift install on macOS or Linux

[compnerd]

That sounds plausible. The Windows Swift distribution packages it. Linux can use readelf instead of llvm-readobj and Darwin can use otool. If we had the llvm tools it would be simpler since it can handle all three platforms.