Remove version number used in 'available' attribute for non-specific platform '*'.

[dingobye]

This patch aims to make swift-corelibs-libdispatch adapted to this PR, which warns for version number in 'available' attribute for non-specific platform '*'.

[jrose-apple]

Do we care about watchOS and tvOS too? tvOS version numbers match iOS's, but watchOS's don't.

[ktopley-apple]

I agree with Jordan - the tvOS and watchOS deprecations should also be included.

[jrose-apple]

I don't think I or Ding knows for sure what those should be! It's also a little funny that these are just in corelibs-dispatch, which is never used on iOS/tvOS/watchOS. Or did we miss some in the overlays too?

[dingobye]

Thank you for the feedbacks, Jordan and Kim!

Can we just remove those lines of @available(*, deprecated: 8.0, ...) here? Just take a look at the relevant part in swift main repo. There are attributes for four platforms macOS/iOS/tvOS/watchOS, among which I think keeping only macOS is sufficient for swift-corelibs-libdispatch project.

[jrose-apple]

I suspect that SCD is trying to match the contents of the Darwin overlay exactly for most of these files, and that they should therefore be kept in sync.

[dingobye]

Alright, let's keep it in sync. This is a conservative solution anyway.

[jrose-apple]

@swift-ci Please test Linux

[ktopley-apple]

This looks OK to me as it is. I think we need to review whether any of these @available lines are required as a separate exercise.