Use correct type for c_ulong and c_long on 32-bit netbsdlike

add CI for mips-musl

and fix the statvfs struct for this target

r? @alexcrichton

I didn't really test the CI part but this target now passes libc-test under QEMU

Add checksums to cargo lock files

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.

and fix the statvfs struct for this target

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