Finish off termios (hopefully!)

`cfmakesane` for FreeBSD and `tcgetsid` for everyone!

This doesn't appear on any other platforms

Add pthread_rwlockattr APIs

I'm basically trying to mirror the existing code for pthread_mutexattr.

Hopefully the non-linux parts are correct - finding the right definitions is rather confusing and occasionally even contradicts existing definitions (e.g. [this](https://github.com/practicalswift/osx/blob/a26375e7b3e01c83e26a23977f909438ed9b31b4/src/libpthread/src/internal.h#L295) `pthread_condattr_t` doesn't match #335).

Add constants for sysconf(3) and pathconf(3)

Add more termios constants

Went through and found some more termios constants that were missing and added them. I skipped some platforms (solaris, uclibc) and assumed Android has the same constants are Linux, as I couldn't find a good reference for what Android exposes, but it generally follows linux, so I assumed the same was true for some of those values.

## References:
 FreeBSD:
   * https://github.com/freebsd/freebsd/blob/d39171bb1f2256bd3bf018314aec600f79b89bc6/sys/sys/_termios.h
   * https://github.com/freebsd/freebsd/blob/d39171bb1f2256bd3bf018314aec600f79b89bc6/include/termios.h
 NetBSD: https://github.com/NetBSD/src/blob/0bff031265b50be8e8b7719aed82212928d6c1df/sys/sys/termios.h
 musl: /usr/x86_64-linux-musl/include/bits/termios.h (identical to Linux-x86_64)
 linux: /usr/include/bits/termios.h
 OpenBSD: https://github.com/openbsd/src/blob/5271000b44abe23907b73bbb3aa38ddf4a0bce08/sys/sys/termios.h
 DragonFlyBSD:
   * https://github.com/DragonFlyBSD/DragonFlyBSD/blob/ddad68003a1b070d6955ae737c834cd3267d3ead/sys/sys/_termios.h
   * https://github.com/DragonFlyBSD/DragonFlyBSD/blob/ddad68003a1b070d6955ae737c834cd3267d3ead/sys/sys/termios.h
 Android: Just use the same as Linux
 uclibc: skipped
 haiku-os: http://cgit.haiku-os.org/haiku/tree/headers/posix/termios.h
 mac: /usr/include/sys/termios.h and /usr/include/sys/_types/_posix_vdisable.h
 solaris: skipped
 bitrig (follows openbsd): https://github.com/bitrig/bitrig/blob/d31f5220a98fae4e74abafe27c8d150843cc8105/sys/sys/termios.h

[uclibc] add more structs to x86_64

This adds more structs to the uclibc/x86_64 port.

Add structs defined in linux/input.h

I was using definitions for these structs from `ioctl` but because @cmr decide to deprecate his crate (and yanked all versions :() I think that `libc` is the best place for them.

In original C header, primitive types uses aliases like `__u16` or `__s32`; for now I replaced them with Rust's counterparts but I'm not sure if it is ok, especially because tests were failing for `u64` (`unsigned long long` vs `unsigned long` on x86_64). Also, should I do something special with union in `ff_effect`?

I would like also to add all constants form `linux/input.h` and `linux/input-event-codes.h` if this PR will be accepted.

Add missing Android constant

This pull requests add the `_SC_NPROCESSORS_CONF` constant to `libc` for Android targets. The similar `_SC_NPROCESSORS_ONLN` already existed.

The reason for adding only this constant is to help fix an [issue with `num_cpus`](https://github.com/seanmonstar/num_cpus/issues/34).

This adds more structs to the uclibc/x86_64 port.

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.