[breaking change] PTRACE_GETFPXREGS and PTRACE_SETFPXREGS were incorrectly re-exported on arm but they are x86 specific

These types have a p_types field, but the resolv.h
header defines p_types __p_types macro that breaks them.

Revert PR 1322

Reverts PR #1322 .

cc https://github.com/rust-lang/rust/pull/60117

Deprecate _pad field on siginfo_t

As discussed in https://github.com/rust-lang/libc/pull/1316

Fix getgrgid_r to accept gid_t.

Closes #1320.

Bump to 0.2.53

This adds more WASI support, and in particular adds support for WASI
being a target_os rather than a target_env, which relates to this PR:

https://github.com/rust-lang/rust/pull/60117

This adds more WASI support, and in particular adds support for WASI
being a target_os rather than a target_env, which relates to this PR:

https://github.com/rust-lang/rust/pull/60117

Add more WASI libc bindings

This picks up #1321, adding more WASI libc bindings, adding several more fixes. In particular, `cargo test --all` including libc-test now builds successfully.

fd_set isn't automatically copyable. While it will be possible to fix
that, for now just remove these so that they don't block other changes.