Temporarily revert the 5.5 merge of unifying PackageDescription 4.0 and 4.2+ since it broke Windows #3554
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Temporarily revert "[5.5] Unify PackageDescription 4.0 and 4.2+ into a single library by using availability annotations instead of #if (#3492)"
This caused the Windows toolchains to break, so this temporarily reverts the change until the installer can be adjusted.
This will be brought back when the Windows toolchain has been adjusted.
This reverts commit d875e4f.