[libcxx] [llvm] [libc++] Make CC and CXX environment variables mandatory in run-buildbot (PR #166875)

[Nikolas Klauser via llvm-commits]

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philnik777 wrote:

I wonder whether we should rename these to `generate-cmake-libcxx-only` and `generate-cmake-libcxx-libcxxabi-only`. There's really nothing windows or android specific to them at this point (which I quite like).

https://github.com/llvm/llvm-project/pull/166875