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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Make all `major`, `minor`, `makedev` into `const fn`.

(backport <https://github.com/rust-lang/libc/pull/4208>)
(cherry picked from commit 37c3333c07105cf29245941ecbbd5733ad0ddd22)

Add makedev for the BSDs

Also, make makedev function safe and const on all platforms.

On Android, change the arguments from signed to unsigned integers to
match the other platforms. The C makedev

Add makedev for the BSDs

Also, make makedev function safe and const on all platforms.

On Android, change the arguments from signed to unsigned integers to
match the other platforms. The C makedev is a macro, so the
signededness is undefined.

Add an integration test for makedev, too, since it's a macro that we
must reimplement.

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Add tests for SIGRTMAX and SIGRTMIN

Add test for SO_EE_OFFENDER

Modelled after the cmsg tests, this wraps the C macro into a function, and then
compares the results to the Rust implementation in libc.

Add an integration test for the cmsg(3) functions.

Since these are defined in C as macros, they must be reimplemented in
libc as Rust functions. They're hard to get exactly right, and they
vary fro

Add an integration test for the cmsg(3) functions.

Since these are defined in C as macros, they must be reimplemented in
libc as Rust functions. They're hard to get exactly right, and they
vary from platform to platform. The test builds custom C code that uses
the real macros, and compares its output to the Rust versions' output
for various inputs.

Skip the CMSG_NXTHDR test on sparc64 linux because it hits a Bus Error.

Issue #1239

Skip the entire cmsg test program on s390x because it dumps core
seemingly before the kernel finishes booting.

Issue #1240

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