[Portability] The use of `CoreFoundation`

[chawyehsu]

While CoreFoundation is still shipped with Swift toolchain on Linux - /usr/lib/swift/CoreFoundation, and you can use tricks to include private headers on Linux, it gets completely removed in the Swift toolchain on Windows and unavailable on Windows.

[marcprux]

Same goes for Android.

[Kyle-Ye]

Same goes for Android.

@marcprux Do you know some alternative C/C++ frameworks on Android?

[Kyle-Ye]

Related discussion: https://forums.swift.org/t/cross-platform-objective-c-interop-with-gnustep-feasibility-discussion/85306/8