macos: vendored libc: combine headers: part 1

- combine *-macos-* → any-macos-any
- SDK headers as a single tree support targeting multiple arch/versions
- bump to SDK 14.0 (release candidate)
52e8354926Michael Dusan committed on 9/25/2023, 7:53:05 PMparentf3ff0b6
64 files changedLine totals unavailable