Handle multi-arch sysroots on Apple platforms
This allows building fat builds where the architectures have different SDKs, e.g. iOS simulator (x86_64) and iOS device (arm64).
Fixes: #19534 (closed)
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This allows building fat builds where the architectures have different SDKs, e.g. iOS simulator (x86_64) and iOS device (arm64).
Fixes: #19534 (closed)