Handle relocated CMake build directories - #278
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This fixes cmake-rs builds when a cached CMake build directory is restored at a different path. It detects the relocated cache and rebuilds it instead of passing stale absolute paths to CMake.
It's kind of a weird thing to do, but this happens with Crane on Nix/macOS. I can understand if you don't think this should go here, but it seems reasonable to me because we already check CMAKE_HOME_DIRECTORY.