Implement utmp for NetBSD

Followed this: https://github.com/NetBSD/src/blob/trunk/include/utmp.h

use *const pointer for NetBSD's pthread_setname_np

Add ucred and socket related types to uclibc-mips32

Fix compilation of the [tokio](https://github.com/tokio-rs) rust for MIPS architecture when using uClibc. Added missed types, which are defined in library headers:
https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/libc/sysdeps/linux/common/bits/socket.h#L320
https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/libc/sysdeps/linux/common/bits/in.h#L35-L36
https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/libc/sysdeps/linux/common/bits/in.h#L140-L143

Should also solve https://github.com/rust-lang-nursery/net2-rs/issues/88

Revisit of #1500

Implement utmpx.h itens for NetBSD

This PR partially closes #1534

If add the constants, structs and and extra traid implmentation

Add support for shared memory operations for solaris/illumos

This is needed because Firefox now uses slice-deque rust crate.

expose futimens() for illumos systems

illumos has an implementation of `futimens()` which we should expose.  I'm working on a broader set of [fixes for illumos](https://github.com/rust-lang/libc/compare/master...jclulow:illumos_fixes) in general, but that's going to take a lot more work to be ready so the test suite doesn't currently seem to function.

Support for RISC-V 64-bit GNU/Linux

Add support for RISC-V 64-bit GNU/Linux.

Follow up to rust-lang/rust#66661.

r? @alexcrichton

Implement utmp for solarish targets

I followed these references:

https://github.com/illumos/illumos-gate/blob/4e0c5eff9af325c80994e9527b7cb8b3a1ffd1d4/usr/src/head/utmpx.h
https://github.com/illumos/illumos-gate/blob/4e0c5eff9af325c80994e9527b7cb8b3a1ffd1d4/usr/src/head/utmp.h

Add initial support for sparc-unknown-linux-gnu

While the Rust compiler already supports the sparc-unknown-linux-gnu target, the libc crate is missing support for it. Let's add it so that Rust can built for this target as well.

adds IPV6_ consts for linux

- add ssm struct and setsockopt constants

Signed-off-by: patrick felt <patrick.felt@sling.com>

Add flock64 to linux_like platforms

Hi,
I'm not sure about what to make of the ifdef in glibc `__USE_LARGEFILE64` that covers it.
but I copied the impl from glibc's headers.
everything is the same except for sparc which has a reserved short int.
and in musl it's just `#define flock64 flock`

Co-Authored-By: gnzlbg <gnzlbg@users.noreply.github.com>

This reverts commit 6ff2e8f1.

Provide SYS_statx for more target_arch/target_env

Fixes #1545

The syscall `statx` is provided by Linux Kernel, so it should be available on any `target_env`/`target_arch`, not only some arch on `gnu`.

Syscall ids are got from [this commit of musl](http://git.etalabs.net/cgit/musl/commit/?id=9864f60e929100e253fc813bd4105d6dd7652787), except for hexagon, which is got from Linux Kernel (`make O=build ARCH=hexagon headers`).

**Not tested yet**

Signed-off-by: patrick felt <patrick.felt@sling.com>

Upgrade to musl 1.1.24 in CI

Required by #1577

Note that in musl 1.1.24, `struct sched_param` from `sched.h` has changed and some fields became reserved. So [these fields](https://github.com/rust-lang/libc/blob/13d4a5da2eafd82d3ebb2acb729d8b8c9148fb1f/src/unix/linux_like/mod.rs#L97) are outdated. I'm not sure if we should rename them, since they are in public API.

I simply skip `struct sched_param` from the test now.

Here's the diff between musl 1.1.23 and 1.1.24
```
diff --git a/include/sched.h b/include/sched.h
index 05d40b1e..7e470d3a 100644
--- a/include/sched.h
+++ b/include/sched.h
@@ -18,10 +18,12 @@ extern "C" {

 struct sched_param {
        int sched_priority;
-       int sched_ss_low_priority;
-       struct timespec sched_ss_repl_period;
-       struct timespec sched_ss_init_budget;
-       int sched_ss_max_repl;
+       int __reserved1;
+       struct {
+               time_t __reserved1;
+               long __reserved2;
+       } __reserved2[2];
+       int __reserved3;
 };
```

add pthread_getname_np for mac os

In macos's `pthread.h`

```c
/*SPI to set and get pthread name*/
__API_AVAILABLE(macos(10.6), ios(3.2))
int	pthread_getname_np(pthread_t,char*,size_t);

__API_AVAILABLE(macos(10.6), ios(3.2))
int	pthread_setname_np(const char*);
```

I believe `pthread_getname_np` is usable in macos after 10.6.

Signed-off-by: Yang Keao <keao.yang@yahoo.com>

Fix build.rs failing with a rustc built from a tarball

Fixes #1601