Fix SIGSTKSZ for DragonFly

sockaddr_nl for netlink sockets

DragonFly/FreeBSD: Make ss_sp *mut c_void as in the other implementat…

This fixes compiling Rust.

 See https://github.com/rust-lang-nursery/libc/pull/50 for details

Fix undeclared type name errors when targeting android aarch64.

Bump to 0.2.2

There are 8 bits in a byte

Reorganize mips/musl/other slightly

Fixes a few constants along the way

This reverts commit 767ba143.

Closes #49

Add NI_MAXHOST

Add a whole mess more android constants

bind additional filesystem APIs

Add time bindings

Fix forgotten ::size_t for freebsd

openbsd port

- remove multiple definition of stack_t
- make types resolv correctly
- correct target definitions
  - dragonfly is already defined as freebsdlike
  - bitrig is an openbsdlike
- imports should be public

Add socketpair