Wide chars are unsigned when normal chars are

sys/stat.h is a machine-independent header, but it has ifdefs for i386.
The version that was called x86_64.rs should be used on powerpc64 too,
but I don't have a machine to test that on.

I just got 'libxul.so: Undefined symbol "mq_close"' when rebuilding Firefox..
How did no one catch this before??

This is correct for both FreeBSD and DragonFly:
https://github.com/freebsd/freebsd/blob/master/lib/librt/Symbol.map
https://github.com/DragonFlyBSD/DragonFlyBSD/blob/e7ab884bd49753f8884eb597d10d6569a08fa0df/lib/librt/mq.c
https://github.com/DragonFlyBSD/DragonFlyBSD/blob/e7ab884bd49753f8884eb597d10d6569a08fa0df/lib/librt/aio.c

Disable tests for the switch target, for now

Add missing sysconf constants for Haiku

Hi,

Could you add some missing Haiku constants (i'm guessing they were added after Haiku port was last updated)?

These are defined in `unistd.h`: https://github.com/haiku/haiku/blob/194a45c6b4183083afdc7fac7b9e85f9162cdeb2/headers/posix/unistd.h#L134-L137

Add ucontext_t/mcontext_t for aarch64 Android

Fix ordering of allowed lints

Add some syscalls from `fs/open.c` on linux/aarch64

This ended up just getting copied from Linux as it appears to be the
same.

Declare `seekdir` and `telldir` for WASI.

These declarations are the same as those for other platforms.

Update comment to clarify

add uclibc `SOCK_RDM` field

In particular:
Add timerfd constants and functions, from sys/timerfd.h.
Add EFD_SEMAPHORE and group all EFD_ constants together.
Add sigtimedwait function, from signal.h.
Add missing fallocate constants and functions, from linux/falloc.h and fcntl.h.
Add xattr functions, from sys/xattr.h.
Add SCHED_ and SEEK_ constants, from linux/sched.h and bits/seek_constants.h.
Add rlimit functions, from sys/resource.h.
Add RENAME_ constants, from stdio.h.
Add ino64_t type, from sys/types.h.

Make semver check workable

add wexecv, wexecve, wexecvp, wexecvpe

Add `MSG_` constants for Xtensa.

FreeBSD: machine register structs

Add constants and eventfd to illumos