unix: add PthreadChdir and PthreadFchdir on darwin

Fixes golang/go#68226

Change-Id: I92052e2319e4edde21b5e1e47ddb5b261d81448a
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unix: skip ethtool driver test for busy interface

This CL skips IoctlGetEthtoolDrvinfo on busy interface tests since
ethtool getting the same result too.

Fixes golang/go#67350

Change-Id: Ia65678e3caab8a9dd42b9cdb8e4cb7f7f0b476da
Reviewed-on: https://go-review.googlesource.com/c/sys/+/586435
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unix: extend support for z/OS

This change syncs the IBM internal version of sys/unix with the public
repository.

There are a variety of new syscalls and const definitions that have been
accumulated over the past few years to support developers using Go on
the platform. Old simulations of calls like 'epoll' and 'fstatfs' have
been replaced with their real counterparts. The zos/s390x syscalls also
have extensive trampolining to handle zos systems that might not have
support for some of these new system calls.

Closes golang/go#67071

Change-Id: I973d9e0abca2b05365308cf2b890438e50ae5957
Reviewed-on: https://go-review.googlesource.com/c/sys/+/582035
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windows: use uint32 for serial comm flags for consistency

This is a follow-up to https://go-review.googlesource.com/c/sys/+/572295
and specifically the comment
https://go-review.googlesource.com/c/sys/+/572295/comment/a00e1a2e_e3b01666/.

All other structs and methods us uint32 in golang.org/x/sys/windows
for flag bitmasks, so make the serial communication structs use uint32
to be consistent with the rest of the package.

As a side effect the DTR_CONTROL_* and RTS_CONTROL_* constants are
updated to reflect the positions of the bits in the 32-bit flags.

Change-Id: Ie19774a8ef5411d7df1e5b0d36806aa1d401fa86
GitHub-Last-Rev: bc93d94
GitHub-Pull-Request: #189
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unix: add API for fsconfig system call

Fixes golang/go#59537

Change-Id: I8d806ace3adad423c633813455d8f758706cee1d
Reviewed-on: https://go-review.googlesource.com/c/sys/+/484995
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windows: support ill-formed UTF-16 in UTF16PtrToString

UTF16PtrToString does not support ill-formed UTF-16 because it uses
utf16.Decode, which expects well-formed UTF-16.

This CL updates the UTF16PtrToString implementation to use
UTF16ToString instead of utf16.Decode, which supports ill-formed
UTF-16 since go1.21 via syscall.UTF16ToString.

Change-Id: Ifb72b6d38a8c08ad90ec6a47eed05fc3739500a1
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windows: add SetFileValidData

Fixes golang/go#61834

Change-Id: Iaff01f5662aa2309e8ac41b346e0d3a42d28af91
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unix: add IoctlLoopConfigure on linux

LOOP_CONFIGURE ioctl is used to setup and configure all loop device
parameters in a single step.
Add to the unix package a new function that exposes LOOP_CONFIGURE.

Fixes golang/go#63962

Change-Id: Ia169d268b52b1384febc6bff9c707b721ab2bb24
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syscall: call getfsstat via libc on openbsd

On openbsd, call getfsstat directly via libc, instead of calling it
via syscall.Syscall.

Updates golang/go#63900

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unix: remove unused readlen and writelen

These were originally added when copying over files from package
syscall. However, their use was removed in CL 129500043. New ports kept
adding these wrappers without using them. They are still unused, so
remove them.

Change-Id: I2ffffe98a5c999d23b63d1f04ee4ad8f807ee736
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