Notable *port* changes (vs devel/llvm11):
- Switch to single llvm-project distfile. This simplifies the port
and support for the old style build process is rotting upstream
after the mono-repo conversion.
- Disable libedit dependency in libLLVM (still used by LLDB). This
is one small step toward a dependency-less clang.
- LLDB docs are disabled due to issues finding python includes when
autogenerating API docs.
Sponsored by: DARPA
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