Bump cmake-rs to improve Mac OS build parallelism #315
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There's a bug on OSX that prevents the CMake jobserver from working properly, and so CMake defaults to a single-threaded build. It's not clear when this is actually going to get fixed, so recent versions of cmake-rs just disable the jobserver and have CMake fall back to the number of available cores:
rust-lang/cmake-rs#229
This means we don't need e6833b0