syscall.

close #3387

close #3392

The landlock syscalls were added to the musl libc in upstream commit ee05b11b67d5[1]:
```
bits/syscall.h: add landlock syscalls from linux v5.13
see

  linux commit a49f4f81cb48925e8d7cbd9e59068f516e984144
  arch: Wire up Landlock syscalls

  linuxcommit 17ae69aba89dbfa2139b7f8024b757ab3cc42f59
  Merge tag 'landlock_v34' of ... jmorris/linux-security

Landlock provides for unprivileged application sandboxing. The goal of
Landlock is to enable to restrict ambient rights (e.g. global filesystem
access) for a set of processes. Landlock is inspired by seccomp-bpf but
instead of filtering syscalls and their raw arguments, a Landlock rule
can restrict the use of kernel objects like file hierarchies, according
to the kernel semantic.
```

Add them to our definitions accordingly

[1] https://git.musl-libc.org/cgit/musl/commit/arch/riscv64/bits?id=ee05b11b67d59a6c5bb4b9d661bcc20bbd0bbe7a

Much like glibc, these defines are same on musl [1] [2]
therefore consolidate the definition in one place
for SOCK_NONBLOCK

[1] https://github.com/search?q=repo%3Abminor%2Fmusl++%22%23define+SOCK_NONBLOCK%22&type=code
[2] https://github.com/search?q=repo%3Abminor%2Fmusl++%22%23define+O_NONBLOCK%22&type=code

F_SETLK and F_SETLKW were not defined therefore define them
and F_GETLK value was not matching the musl port hence fixed

These defines are not architecture specific in musl [1] therefore move them
to be common

[1] https://git.musl-libc.org/cgit/musl/tree/include/fcntl.h#n48

This define is not architecture specific in musl [1]

[1] https://git.musl-libc.org/cgit/musl/tree/include/sys/socket.h#n90
Signed-off-by: Khem Raj <raj.khem@gmail.com>

This mirrors more of the constants that, for example, are available in
linux/mod.rs.

rust-lang/rust#82450 (comment)

They no longer exists: rust-lang/cargo#12845

Use new check-cfg syntax in newer nightly

[MCP636 - Simplify and improve explicitness of the check-cfg syntax](rust-lang/compiler-team#636) introduced a new syntax for check-cfg.

This PR adjust the `build.rs` code to use the new syntax on `rustc >= 75`.
The old syntax is still used on older version since on rust-lang/rust we need to be compatible with both for now.

musl fixes and musl+riscv32 fixes

https://github.com/kraj/libc/tree/kraj/musl-fixes rebased onto main with the duplicate symbols fixed up (though the logs from the previous run have expired so I might have missed something).

Closes #3191

Add various constants from OpenBSD's sys/exec_elf.h.

This mirrors more of the constants that, for example, are available in linux/mod.rs.

These values are taken from https://github.com/openbsd/src/blob/master/sys/sys/exec_elf.h, though, unsurprisingly, they match those on Linux's `elf.h` (occasionally with different formatting, which I have preserved in this PR).

…Titor

riscv64/musl: Add landlock syscalls

The landlock syscalls were added to the musl libc in upstream commit ee05b11b67d5[1]:
```
bits/syscall.h: add landlock syscalls from linux v5.13
see

  linux commit a49f4f81cb48925e8d7cbd9e59068f516e984144
  arch: Wire up Landlock syscalls

  linuxcommit 17ae69aba89dbfa2139b7f8024b757ab3cc42f59
  Merge tag 'landlock_v34' of ... jmorris/linux-security

Landlock provides for unprivileged application sandboxing. The goal of
Landlock is to enable to restrict ambient rights (e.g. global filesystem
access) for a set of processes. Landlock is inspired by seccomp-bpf but
instead of filtering syscalls and their raw arguments, a Landlock rule
can restrict the use of kernel objects like file hierarchies, according
to the kernel semantic.
```

Add them to our definitions accordingly

[1] https://git.musl-libc.org/cgit/musl/commit/arch/riscv64/bits?id=ee05b11b67d59a6c5bb4b9d661bcc20bbd0bbe7a

Add stat64at function declaration to AIX

In AIX, when large file API enabled, fstatat will be redirected to stat64at.

Also, fix clockid_t to correct definition, as time-rs builds well with this change.

adding getmntinfo/getmntvinfo for DragonFlyBSD.

close #3392

adding MOVE_MOUNT* constants for linux to use with SYS_move_mount

syscall.

close #3387

freebsd adding PROT_MAX|PROT_MAX_EXTRACT mmap flags

close #3329

linux/android adding few if_alg.h constants.

close #3329

Setup Dependabot for GitHub Actions

For NetBSD: add entry for NetBSD/riscv64.

adding more recent pthread_get/setname_np calls to freebsd/dragonflybsd