Add BSD flags

Unify some BSD flags

These BSD flags have common value in all OSes, so I've merged them into root `mod.rs`.
- `O_ACCMODE`
- `O_RDONLY`
- `O_WRONLY`
- `O_RDWR`
- `O_APPEND`
- `O_CREAT`
- `O_TRUNC`
- `O_EXCL`
- `O_SYNC`
- `O_NONBLOCK`
- `O_SHLOCK`
- `O_EXLOCK`
- `O_FSYNC`
- `O_NDELAY`

Fix AT_ constants for DragonFly

struct tm for Windows

As documented here:

https://msdn.microsoft.com/en-us/library/windows/hardware/ff567981(v=vs.85).aspx

I've verified it matches `corecrt_wtime.h` file from Win10 SDK.

https://msdn.microsoft.com/en-us/library/windows/hardware/ff567981(v=vs.85).aspx

Matches corecrt_wtime.h from Win10 SDK

Bumped version number

Bumped version number so that the latest changes go to crates.io.

Fixed missing EPOLLONESHOT for android

resolve #548

Various MIPS cleanups

This PR contains a few cleanups to the MIPS part of the bindings. It mostly moves stuff out of `mips/mips32.rs` into `mips/mod.rs` which is identical between mips32 and mips64, mostly because mips64 is missing a number of syscalls. In addition, I add `struct flock` which was missing on mips64.

In addition, move the syscalls to the mips module file because they are
all identical in mips32 and mips64.

As a result of this commit, glob64_t will be added to mips64.

Add dirfd on netbsd

follow up of https://github.com/rust-lang/libc/pull/571

Add schedule params & priority pthread functions

Fixes #609. Provides bindings to `pthread_getschedparam`, `pthread_setschedparam` and `pthread_setschedprio` functions.

P.S. My first PR in such a project.
P.P.S. `libc-test` crashed at building stage with a lot of errors, so I hope `travis` will do a check.
P.P.P.S. These functions are tested to work on Linux (Ubuntu 14.04) with my own crate. I will release it next week, it provides ability to control thread schedule policies and priorities.

add dirfd on unix

Add unix seteuid()

Adds prototype for unix seteuid() as defined [here](http://pubs.opengroup.org/onlinepubs/009695399/functions/seteuid.html).

Adds prototype for unix seteuid() as defined here: http://pubs.opengroup.org/onlinepubs/009695399/functions/seteuid.html

add a number of linux syscalls

vfork, wait4, getresuid, getresgid, personality, vhangup,
swapon, swapoff, getdomainname, setdomainname, iopl, ioperm

Make changes to reflect this