[swift/release/6.2][clang][modules] Determine if the SDK supports builtin modules independent of the target #10445
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Whether the SDK supports builtin modules is a property of the SDK itself, and really has nothing to do with the target. This was already worked around for Mac Catalyst, but there are some other more esoteric non-obvious target-to-sdk mappings that aren't handled. Have the SDK parse its OS out of CanonicalName and use that instead of the target to determine if builtin modules are supported.
rdar://147975407