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

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

Add x86_64 module to uclibc/mod.rs

Add experimental L4re support

This PR introduces a UNIX-alike target for the l4re microkernel
operating system. While this system is not a UNIX system at all, it is
easiest to use the POSIX interface and hence benefit from common
definitions.

This version is a very early draft, only the basic data types have been
verified and most of the complex data types (structs and unions) have
not been ported yet.

Thanks to TobiasSchaffner for providing his patched version, to verify some assumptions.