[libc++][CI] run-buildbot and libcxx-lit need a way to pass the paths to cmake and ninja (#213511) macOS/Xcode don't have cmake or ninja anywhere in a default PATH, so run-buildbot and libcxx-lit fail unless you do some PATH surgery before running them. Allow passing them as environment variables instead, so run-buildbot can be invoked as `CMAKE=$(xcrun --find cmake) NINJA=$(xcrun --find ninja) CC=$(xcrun --find clang) CXX=$(xcrun --find clang++) run-buildbot` on macOS. Allow cmake to be passed to libcxx-lit in a similar fashion.
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