[Sharing progress] Tried to revive LLVM/Clang/Libc++ pkgs and port Rust

[ASSI]

ASSI via Cygwin-apps writes:
> I've started a local llvm-revival branch…  I got sidetracked with OCaml,
> but that will need some more time and currently I have just disabled the
> OCaml bindings in LLVM instead (not removed: this is controlled by a
> variable in the script and another variable to control the LLVM target
> list).
>
> * LLVM Updates
>   - LLVM 9.0.1 revived
>     + update fedora to f31
>     + update patches
>     + disable OCAML via OCAML_SUPPORT
>     + control build targets via LLVM_TARGETS
      + enable testing

Many of the (few) failing tests run into trouble with fork errors and
sometimes succeed when run again, so from that angle I think the build
is good.


Regards,
Achim.
-- 
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