Update the SECCOMP regex to fetch more SECCOMP constants.

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This CL just port CL 376334 from main repo with minor modification.

Fixes golang/go#65015

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Fixes golang/go#65055, the unexpected behavior of token.Environ in parsing entries containing runes larger than 2 bytes in size

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This test imports the "slices" package, which did not exist in Go 1.20.
The test passes on Go 1.21 and above, and the behavior of the function
under test is unlikely to vary by platform, so it doesn't seem worth
refactoring the test to work with older releases.

Updates golang/go#65055.
Fixes golang/go#65223.

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Change-Id: Ie0cc6803af5b3ede657ce516e657b0356cd91175
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Avoid compiling regular expressions for each loop iteration, rather
declare them as package level variables so they are only compiled once.

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Win32 defines the `done` param as optional for ReadFile and WriteFile
functions. We should support this case too.

Fixes golang/go#65365.

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This reverts CL 559375.

Reason for revert: introduced a different regression (golang/go#65378).

Fixes golang/go#65378.
Updates golang/go#65365.

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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.

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…Utsname) on FreeBSD due to truncated fields.

Fixes golang/go#65585.

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go.mod specifies go 1.18. Drop go1.n version tags for older, unsupported
versions.

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Fixes golang/go#59537

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The calls `Mmap` and `Munmap` were removed for z/OS.
Syscall removed occurred in: 508397

This change exposes them in a z/OS specific file
(to remove the accidental deletion of them in future refactors of the APIs for `unix-like` OSes).

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…rr error)

Fixes golang/go#66234

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Serial ports are still widely used to communicate with a large range of
devices.

This change adds the remaining functions described in "Serial
Communications in Win32", enabling Go applications and libraries to be
written that support the full set of serial port functionality on
Windows.

x/sys/unix already has equivalent functionality through termios.

See https://learn.microsoft.com/en-us/previous-versions/ms810467(v=msdn.10).

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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.

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