Switch back to matching `target_os` rather than `target_vendor`

`ctest` is very particular about this and the current configuration,
though working most of the time, seems to cause occasional CI err

Switch back to matching `target_os` rather than `target_vendor`

`ctest` is very particular about this and the current configuration,
though working most of the time, seems to cause occasional CI errors
that can't easily be explained or mitigated. Switch back to matching all
Apple `target_os` options until `ctest` is fixed.

(backport <https://github.com/rust-lang/libc/pull/4282>)
(cherry picked from commit a986f81dbc23bf669fdecd81a74b6ae3999cb8c8)

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fix: Revert vita's c_char to i8

(backport <https://github.com/rust-lang/libc/pull/4258>)
(cherry picked from commit e5a669b526efd0db5809eb56b6dee3736d7a5c58)

Copy definitions from core::ffi and centralize them

(backport <https://github.com/rust-lang/libc/pull/4256>)
(cherry picked from commit 95446f458e472511d65e560224c1b85570e50944)

[ include the neces

Copy definitions from core::ffi and centralize them

(backport <https://github.com/rust-lang/libc/pull/4256>)
(cherry picked from commit 95446f458e472511d65e560224c1b85570e50944)

[ include the necessary changes for psp, which isn't part of the
original commit since the target is not present on main - Trevor ]

show more ...