Louis Dionne 1b06d2cf15 [libc++] Refactor the Apple build scripts
This patch upstreams some changes we've made internally to how we're
building the libc++ dylib on Apple platforms. The goal is still to
eventually get rid of `apple-install-libcxx.sh` entirely and have a
proper way to mirror what we do internally with just the normal CMake
configuration.

Differential Revision: https://reviews.llvm.org/D118912
2022-02-16 16:28:13 -05:00
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