* Rework of original patches from Niels Sascha Reedijk
  that include style and build fixes for libc master

add MSG_NOSIGNAL (linux, android)

see rust-lang/rust#36426

Add shadow password bindings

Add shadow password bindings: setspent, endspent, getspent, getspnam plus spwd, the corresponding struct.

[Example code](https://github.com/philippkeller/apue-rust/blob/master/src/bin/e06-01-shadow-pw.rs) (tested on Linux 4.4.0-21-generic)

Add shadow password bindings: setspent, endspent, getspent, getspnam plus spwd, the corresponding struct

Add getchar_unlocked and putchar_unlocked

Adds [getchar_unlocked](http://pubs.opengroup.org/onlinepubs/9699919799/functions/getchar_unlocked.html) and [putchar_unlocked](http://pubs.opengroup.org/onlinepubs/9699919799/functions/putchar_unlocked.html).

Add EAI_SYSTEM getaddrinfo error code.

This is useful to decide if value returned from getaddrinfo is actual
error or you should look at errno instead.

This is useful to decide if value returned from getaddrinfo is actual
error or you should look at errno instead.

Add System V message queue bindings for Linux (glibc/musl)

Add netlink constants

Add netlink constants from linux/netlink.h

Signed-off-by: Jana Radhakrishnan <mrjana@gmail.com>

define `sethostname` under OpenBSD and Bitrig

factorize the definition with NetBSD

add time, localtime

time, localtime and strftime are all in POSIX.1 and should IMO all be part of `libc`.

I [tested the bindings](https://github.com/philippkeller/apue-rust/blob/master/src/bin/f06-11-strftime.rs) - works fine on OSX and linux.

And: I added the netbsd aliases based on `time.h` of netbsd

couldn't get strftime to work, even with help from IRC. Removing it now as it's not worth the hassle

Add netlink constants from linux/netlink.h

Signed-off-by: Jana Radhakrishnan <mrjana@gmail.com>

factorize the definition with NetBSD

Adding accept4 function

accept4 is a version of accept that takes flags.
It is more efficient for certain use cases, and has
a more modern path inside the kernel.

Adding POSIX 'E' error code constants for Windows

Believe it or not, Windows actually defines a few POSIX
'E' error codes (eg EINVAL). By adding them to libc, the Windows
bindings for things like `read()` become useful.

Believe it or not, Windows actually defines a few POSIX
'E' error codes (eg EINVAL). By adding them to libc, the Windows
bindings for things like `read()` become useful.

accept4 is a version of accept that takes flags.
It is more efficient for certain use cases, and has
a more modern path inside the kernel.

aarch64: test against Ubuntu 16.04

also "backport" two glibc fixes:

- ipc_perm.mode is c_uint. [commit][1] [discussion][2]
- bump SIGSTKSZ to 16384. [commit][3] [discussion][4]

so libc-test passes.

[1]: https://sourceware.org/git/?p=glibc.git;a=commit;h=5c40c3bab2
[2]: https://www.sourceware.org/ml/libc-alpha/2014-10/msg00446.html
[3]: https://sourceware.org/git/?p=glibc.git;a=commit;h=b763f6ae859ecea70a5dacb8ad45c71d5f667e2e
[4]: https://sourceware.org/ml/libc-alpha/2015-04/msg00033.html

closes #231

r? @alexcrichton

libc-test: cargo update

to pick up the recent changes in the ctest repo.

r? @alexcrichton

also "backport" two glibc fixes:

- ipc_perm.mode is c_uint. [commit][1] [discussion][2]
- bump SIGSTKSZ to 16384. [commit][3] [discussion][4]

so libc-test passes.

[1]: https://sourceware.org/git/?p=glibc.git;a=commit;h=5c40c3bab2
[2]: https://www.sourceware.org/ml/libc-alpha/2014-10/msg00446.html
[3]: https://sourceware.org/git/?p=glibc.git;a=commit;h=b763f6ae859ecea70a5dacb8ad45c71d5f667e2e
[4]: https://sourceware.org/ml/libc-alpha/2015-04/msg00033.html

closes #231

Factor common code out of the bitrig and openbsd modules

The new directory structure better reflects the historical relationship
of the BSDs, and includes 400 fewer duplicative lines of code.

The new directory structure better reflects the historical relationship
of the BSDs, and includes 400 fewer duplicative lines of code.

Diff reduction between OpenBSD and Bitrig

Bitrig had a number of errors and omissions.
Also, fill out struct glob_t on all BSDs.

A follow-up commit will condense OpenBSD/Bitrig common code into a separate file.

use new openbsd-6.0 qcow2 image

this version is using `openbsd-6.0-without-pkgs` image.

- allow QEMU name to have subdirectory inside (replace `/` by `__` in
  the filename)
- add a new code path for plain qcow2 image (for efficient bandwidth
  usage, the qcow2 is expected to use compressed qcow2 format)
- move freebsd image to explicitly download the gzipped QEMU