[llvm-branch-commits] [lldb] [lldb] Drop support for using the external shell (PR #209627)

[David Spickett via llvm-branch-commits]

https://github.com/DavidSpickett approved this pull request.

This is the only reference to LIT_USE_INTERNAL_SHELL in lldb/, and I don't see any buildbots using it. LGTM.

https://github.com/llvm/llvm-project/pull/209627