Add dl_iterate_phdr to some BSD OSs

Add dl_iterate_phdr for freebsd, openbsd and netbsd: #1066
cc https://github.com/rust-lang/backtrace-rs/issues/325

* Include some header files
* Ingore tests for p_type field of `Elf*_Phdr` because of
  conflicting with p_type macro from resolve.h

Release 0.2.80

Allow `deprecated` attribute on `f!` macros to fix dragonfly build

Fixes #1957
cc `@nagisa` I think this should resolve the build :)

Add a deprecation note to `time_t` on musl

cc #1848

Revive tests for MIPS64

This reverts commit 6e719f77.

This reverts commit 7aa60269.

linux: Add definitions for Multipath TCP

The Linux kernel recently gained support for [Multipath TCP](https://en.wikipedia.org/wiki/Multipath_TCP), a protocol which builds upon TCP. This patch adds `IPPROTO_MPTCP` to open new sockets and `TCP_ULP` to query the upper layer protocol of traditional TCP sockets (which is set to `mptcp` for all underlying connections)

Source: [tcp: Define IPPROTO_MPTCP](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=faf391c3826cd29feae02078ca2022d2f912f7cc)

cc #1896

Co-authored-by: Yuki Okushi <huyuumi.dev@gmail.com>

Bring the MUSL version of siginfo_t up-to-date.

**Background**

As far as I can tell, the [current MUSL version of `siginfo_t`](https://git.musl-libc.org/cgit/musl/tree/include/signal.h#n97) includes fields like [`si_pid`](https://git.musl-libc.org/cgit/musl/tree/include/signal.h#n108) and [`si_uid`](https://git.musl-libc.org/cgit/musl/tree/include/signal.h#n109).

**Change**

This update unifies `siginfo_t` support between GNU and MUSL.

Unpin the `cc` crate version

Fixes #1933

Add constants of socket options

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

Add issue templates with new style

Add lockf() operations to Android

Reference:
https://github.com/aosp-mirror/platform_bionic/blob/master/libc/include/bits/lockf.h#L39-L46

Reference:
https://github.com/aosp-mirror/platform_bionic/blob/master/libc/include/bits/lockf.h#L39-L46

We leave IPPROTO_MAX as is for the time being. However, in recent
kernel releases IPPROTO_MAX is actually higher and reflects the
addition of IPPROTO_MPTCP.

Rollup of 3 pull requests

Successful merges:

 - #1943 (Add definitions for Linux debug related MAGIC)
 - #1944 (Include sendfile64() for Linux)
 - #1945 (Disable libc-test for MIPS64 for now)

Failed merges:

r? `@ghost`

Disable libc-test for MIPS64 for now

Include sendfile64() for Linux

`sendfile` uses the `off_t` type, which is platform dependent. On 64-bit architectures, I can pass an `off64_t` as the third argument to `libc::sendfile`, but on 32-bit architectures, this does not compile. `sendfile64` on the other hand uses a 64-bit wide offset even on 32-bit architectures, so that `off64_t` can be used.

Excerpt from `man 2 sendfile`:

> The original Linux sendfile() system call was not designed to handle large file offsets. Consequently, Linux 2.4 added sendfile64(), with a wider type for the offset argument.

I hope that supporting Linux versions below 2.4 is not a requirement for libc.

Add definitions for Linux debug related MAGIC

This commit adds definitions for Linux debug related MAGIC to confirm if the filesystem for debug is mounted.

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

Revive `sparc-unknown-linux-gnu` CI

cc rust-lang/rust#58564

Add some more targets for build testing

- `x86_64-unknown-illumos`: We now have the illumos module and it'd be great if we could test it actually.
- `aarch64-apple-darwin`: This target will be used more widely in the future and it should make sense to run CI for it as well.