There are none of them in `libc` except for `__progname` on Android, but
that one cannot be tested because it's not present in any header files.

Add some more elf types

Add mallopt

First time contributor. Thanks for the excellent contributing guide.
I'm not quite sure I put the method in the right place. [The GNULib docs](https://www.gnu.org/software/gnulib/manual/html_node/mallopt.html) say its not on Android 7.1, but there are [mentions of it in some android headers](https://android.googlesource.com/platform/bionic/+/master/libc/include/malloc.h).

Add additional Redox OS functions

This adds `chown`, `fchown`, `setenv`, and `unsetenv` to the `redox` module, and reorders the functions by name

Undo division of in6_addr on Fuchsia

sparc64 tests are passing again

Closes #1064 .

Closes #1064 .

Fix and cleanup Fuchsia

Remove false support for power and mips.
Fix aarch64 definitions of nlink_t and blksize_t.

r? @alexcrichton

cc @sulanov

Remove false support for power and mips.
Fix aarch64 definitions of nlink_t and blksize_t.

Add TIOCGWINSZ accessor to solaris module

Signed-off-by: Ian Henry <ihenry@chef.io>

I recently noticed downstream that these request values were unavailable and needed for things like [the pb crate](https://github.com/a8m/pb). To get access to the request value I ran the following simple C code:
```
#include <sys/ioctl.h>
#include <stdio.h>
#include <sys/termios.h>

int main(int argc, char **argv) {
    printf("Code: 0x%04lx\n", TIOCGWINSZ);
    printf("Code: 0x%04lx\n", TIOCSWINSZ);
    return 0;
}
```
To then validate the change I ran the following simple rust:
```
extern crate libc;

use libc::{ioctl, winsize, STDOUT_FILENO, TIOCGWINSZ};

fn main() {
    let mut wsize = winsize {
        ws_row: 0,
        ws_col: 0,
        ws_xpixel: 0,
        ws_ypixel: 0,
    };
    unsafe {
        ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut wsize);
    }
    println!("Sizes: {{ rows: {}, cols: {}, xpixel: {}, ypixel: {} }}",
             wsize.ws_row,
             wsize.ws_col,
             wsize.ws_xpixel,
             wsize.ws_ypixel);
}
```

Signed-off-by: Ian Henry <ihenry@chef.io>

NetBSD: correct link_name of some time-related functions

Add exchangedata for osx

The futimes(), lutimes(), mq_timedreceive(), and mq_timedsend()
functions were linking against legacy library symbols that need 32-bit
time_t in structures, resulting in an ABI mismatch with 64-bit time_t.

Update ctest to 0.2

Add libc definitions for Megaton-Hammer, a Switch Homebrew toolchain

I'm working on a pure-rust toolchain to write homebrew for the Nintendo Switch called [Megaton-Hammer](http://github.com/megatonhammer/megaton-hammer). I'm hoping to get those definitions upstreamed to simplify my life :).

This toolchain does not depend on a C compiler or a libc (it reimplements everything in rust) - but given many crates in the Rust ecosystem rely on the libc crate for the definition of various common types, this is what I came up with.

I was wondering what a good target triple would be ? I currently gate the implementation behind `target_os = "switch"`, but if this goes upstream I figure that might cause trouble for people using the Nintendo SDK (they might already be using `target_os = "switch"` for some things). Would it be better to go with `target_env = "megatonhammer"`?

NetBSD: add basic types for aarch64

NetBSD: correct c_char signedness on arm and powerpc

Bump version to 0.2.43

Would be nice to have the new align feature from #1044 available for general use. But mostly I want this released since I have problems using the align feature for a PR on libstd, and I suspect it's somehow because I try to use an unpublished libc (https://github.com/rust-lang/rust/pull/52872).