Allow new `unpredictable_function_pointer_comparisons` lints

These appeared in a recent nightly from our `PartialEq` derives. Add
`allow`s where needed to suppress them, since removing the derive wo

Allow new `unpredictable_function_pointer_comparisons` lints

These appeared in a recent nightly from our `PartialEq` derives. Add
`allow`s where needed to suppress them, since removing the derive would
be breaking.

(backport <https://github.com/rust-lang/libc/pull/4489>)
[ applied to PSP as well - Trevor ]
(cherry picked from commit e6378105c41a6bf525bd6a746db11e0c52ce172e)

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Replace handwritten `Debug` impls with derives

`s_no_extra_traits!` doesn't derive `Debug` so there are a lot of
handwritten implementations. However, since we have a derive-like
solution for unions

Replace handwritten `Debug` impls with derives

`s_no_extra_traits!` doesn't derive `Debug` so there are a lot of
handwritten implementations. However, since we have a derive-like
solution for unions now (printing them like an opaque struct), there
really isn't any reason these can't all be derived.

Add `derive(Debug)` to `s_no_extra_traits`, still gated behind `feature
= "extra_traits"`, which allows getting rid of manual implementations.

(backport <https://github.com/rust-lang/libc/pull/4471>)
(cherry picked from commit 65c39bf1b0c7b904cf512280860120307d17703b)

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cygwin: posix_spawn_file_actions_add[f]chdir[_np]

(backport <https://github.com/rust-lang/libc/pull/4387>)
(cherry picked from commit e46d0c7e74701ea90fd1a8f562620aa5b26c97ad)

Fix test on cygwin

And fill semver file for cygwin.

(backport <https://github.com/rust-lang/libc/pull/4357>)
(cherry picked from commit 5c8804bedbe51db13fff08dcd31c2afc1c0de31c)

Add new socket options for cygwin

(backport <https://github.com/rust-lang/libc/pull/4350>)
(cherry picked from commit 29d3d1428a563eb20d417d1c967816fa5d914eb5)

cygwin: fix member types of statfs

(backport <https://github.com/rust-lang/libc/pull/4324>)
(cherry picked from commit 9b403359a6a53acb07f0e27a2b72e6d8148f2524)

cygwin: add statfs & fcntl

Needed by rustix support:

* statfs, fstatfs, and struct statfs
* posix_fadvise, posix_fallocate, fallocate, and constants

(backport <https://github.com/rust-lang/libc/pu

cygwin: add statfs & fcntl

Needed by rustix support:

* statfs, fstatfs, and struct statfs
* posix_fadvise, posix_fallocate, fallocate, and constants

(backport <https://github.com/rust-lang/libc/pull/4321>)
(cherry picked from commit f007c3e8f0a55de82db019c2652d0838bb35dfb1)

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Cygwin: Add PTY and group API

* `forkpty` & `openpty`: for nix::pty
* `getgrgid_r`, `getgrouplist`, getgrnam_r`, `initgroups`: for `user` feature of `nix::unistd`

(backport <https://github.com/rust

Cygwin: Add PTY and group API

* `forkpty` & `openpty`: for nix::pty
* `getgrgid_r`, `getgrouplist`, getgrnam_r`, `initgroups`: for `user` feature of `nix::unistd`

(backport <https://github.com/rust-lang/libc/pull/4309>)
[ update message to mention Cygwin - Trevor ]
(cherry picked from commit 3dd709264d2777caf11f62b906febd0103e0dd81)

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Cygwin: Fix strerror_r

(backport <https://github.com/rust-lang/libc/pull/4308>)
[ update message to mention Cygwin - Trevor ]
(cherry picked from commit e5f9b4eddc105b5e7b57d69e7fd328897ee2c77a)

Cygwin: Fix usage of f!

(backport <https://github.com/rust-lang/libc/pull/4308>)
[ update message to mention Cygwin - Trevor ]
(cherry picked from commit cd4be97305fc0e8f4a355a8cd6f816c3c7ca5f63)

cygwin: add support

Co-authored-by: Ookiineko <[email protected]>

(backport <https://github.com/rust-lang/libc/pull/4279>)
(cherry picked from commit f5569b1d574768751de109bf51e08348abc7f7

cygwin: add support

Co-authored-by: Ookiineko <[email protected]>

(backport <https://github.com/rust-lang/libc/pull/4279>)
(cherry picked from commit f5569b1d574768751de109bf51e08348abc7f7d3)

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