Add iPhoneOS17.6 SDK

[leptos-null]

What does this implement/fix? Explain your changes.

Adds the iOS 17.6 SDK. iOS 17.6 is the last minor version for the iOS 17 major version (since iOS 18 has been fully released).

Does this close any currently open issues?

Yes, #78

Any relevant logs, error output, etc?

Generated using https://github.com/leptos-null/theos-sdks/actions/runs/11542516574

Any other comments?

• Used Xcode 15.4 which provides the iPhoneOS 17.5 SDK
• Used the symbols from iPhone15,4_17.6_21G80_Restore.ipsw

Where has this been tested?

Operating System: …

Platform: …

Target Platform: …

Toolchain Version: …

SDK Version: …

[leptos-null]

For testing, I compiled https://github.com/Luki120/Areesha.
This resulted in lots of undefined symbols errors. Seemingly for public API in UIKit, for example:

Undefined symbols for architecture arm64:
  "(extension in UIKit):Foundation.IndexPath.row.getter : Swift.Int", referenced from:

which looks like the symbol for https://developer.apple.com/documentation/foundation/indexpath/1779554-row.

There were about 50 errors, all looked like UIKit

[leptos-null]

The problem appears to be that iPhoneOS17.6.sdk/usr/lib/swift/libswiftUIKit.tbd does not contain the symbols that we expect to be there.
I've not checked if there are other cases.

For now, this SDK does not appear to be ready to use.

[L1ghtmann]

Just adding here for future reference that I think having a test suite for SDKs would also be valuable re the issues encountered with the first pass of 17.6