54c7754f3118bcb6ea598246c9c0458043de4af9 build: use aarch64 Clang if cross-compiling for darwin on aarch64 (fanquake)
Pull request description:
If we're cross-compiling for darwin on aarch64 hardware, we need to
use a Clang that will run on that hardware.
Only tested in a Linux Docker container (aarch64-unknown-linux-gnu),
running on an Apple M1 mac-mini (aarch64-apple-darwin20.5.0).
ACKs for top commit:
hebasto:
ACK 54c7754f3118bcb6ea598246c9c0458043de4af9, I agree it can be merged (fix in #22448 is orthogonal to this one).
Tree-SHA512: 66c530097a5dc072a0a00dc22eb3d4a7d923dfa8ab8160f7c3e395cbe58da324f367548d673c0510606f5225d5d37bb5607a76b1703b8b03ac7d2cceeccbd542