Merge pull request #449 from asomers/aio

libc-test/build.rs

src/unix/bsd/apple/mod.rs

src/unix/bsd/freebsdlike/dragonfly/mod.rs

src/unix/bsd/freebsdlike/freebsd/mod.rs

src/unix/bsd/freebsdlike/mod.rs

src/unix/bsd/netbsdlike/netbsd/mod.rs

src/unix/mod.rs

src/unix/notbsd/android/mod.rs

src/unix/notbsd/linux/mips.rs

src/unix/notbsd/linux/mips64.rs

src/unix/notbsd/linux/mod.rs

src/unix/notbsd/linux/musl/mod.rs

src/unix/notbsd/linux/other/mod.rs

src/unix/notbsd/linux/s390x.rs

src/unix/notbsd/mod.rs