cmake: handle separate prefix for LLVM/MLIR/clang #748
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Some Linux distributions (i.e. NixOS) install LLVM, MLIR, and clang in different prefixes. On these distributions, variables like
LLVM_INCLUDE_DIRS
andMLIR_INCLUDE_DIRS
have different values. These changes handle a few instances of this issue to get VAST building on NixOS and Nix on Darwin.