Update supported LLVM versions #616
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This PR adds support in CMake for LLVM 15; we don't currently offer it as an officially-supported version as we're blocked on it reaching the upstream Nix repositories, but it's useful for it to be supported for rolling-release operating systems like macOS / Homebrew.
It also drops support for LLVM 10 and 11; this keeps us at a rough rolling cadence of ~4 LLVM versions (2 years worth) supported. We no longer need 10 as every OS we support allows 12 to be installed (this wasn't the case before we dropped support for Ubuntu Bionic). Additionally, this better reflects the CI process as we test 12, 13, 14 using the Nix flake.