Generalise internal cross-image handling #16725
Merged
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We are planning to add a macOS 11 arm64 cross-build to the mix so need to make the existing cross-build logic apply to multiple macOS versions. x86_64 will probably stay on 10.11 but this is TBC depending on subsequent testing and I may try various combinations here.
Once this change is in place, I plan to build new cross-build images for Portable Ruby which I'll then test against Portable Ruby CI.