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ghdl-llvm: re-pin LLVM
Supports only up to LLVM version 20 (see their [`configure` script]: <https://github.com/ghdl/ghdl/blob/v5.1.1/configure#L312-L327>), but un-pinned version in nixpkgs is version 21.
Supports only up to LLVM version 20 (see their [`configure` script]: <https://github.com/ghdl/ghdl/blob/v5.1.1/configure#L312-L327>), but un-pinned version in nixpkgs is version 21.