In preparation for rust-lang/rust#37545 this is adding the appropriate
directives to libc to get included.

Added tcsetpgrp

Enable musl with aarch64

Add setresuid/setresgid for linux

Signed-off-by: Dylan Reid <dgreid@chromium.org>

Add support for Fuchsia

Try to fix powerpc64 and update to crates.io ctest

This reverts commit 7ac91c6d.

Merge two separate config blocks for conditionally including ai_addr
in the addrinfo struct for unix/notbsd.

The reference to the unwind lib belongs in libstd, not here. Also fix
lint error.

These patches add support for the Fuchsia operating system. For the
time being, it shares a lot of infrastructure with the Linux target,
because of the use of a musl-based libc.

Add UNIX 98 pty functions

Bump to 0.2.17

Add SO_REUSEPORT to mips64

Go back to stable for rustdoc

Fix the build on s390x

pass --target on appveyor

Make the AF_NETLINK constant available for Android

Currently the `AF_NETLINK` constant is not available for Android, but [it has the same value as on Linux](https://android.googlesource.com/kernel/common/+/android-4.4.y/include/linux/socket.h#177). To fix it, this patch moves the definition to the common `notbsd/mod.rs`.

(this fixes an [issue we found in Servo](https://github.com/servo/servo/issues/13154#issuecomment-251325701))

Use workspaces in this repo

Also cache on appveyor to speed up builds.

Also cache on appveyor to speed up builds.

Haiku: Add missing EAI_SYSTEM const

define more MSG_NOSIGNAL

follow-up on rust-lang/rust#36824

Typo in unix/solaris/mod.rs

Define CLONE_NEWCGROUP

Should be fairly self explanatory.

* Override the compiler via CC; ./configure can't seem to detect it.
* Unset CROSS_COMPILE when running make. Per the comment, we otherwise
  end up invoking commands like i686-ar.

Musl 1.1.14 defined these incorrectly, and we followed suit. They're
fixed in 1.1.15, so we fix them here as well.

Since these are kernel ABIs, the correct values match other libc
implementations, so we move them up to the topmost module possible.