bootstrap: generalize check for cross-compilation on Darwin #5755
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...so that the build with swiftpm can start.
This will allow to build a Swift toolchain on Apple Silicon
Addresses rdar://99484030
Motivation:
We are ironing out the current issues we are having when building a toolchain on Apple Silicon, and after #5754 we are now hitting
Modifications:
Amend a check so not to assume any particular architecture when assessing if we are cross compiling on Darwin.
Result:
We should be able to build swiftpm as part of a Swift toolchain on Apple Silicon