Merge branch 'various-rumprun-fixes' of https://github.com/gandro/libc into merge

libc-test/build.rs

src/lib.rs

src/macros.rs

src/unix/bsd/openbsdlike/bitrig.rs

src/unix/bsd/openbsdlike/mod.rs

src/unix/bsd/openbsdlike/openbsd.rs

src/unix/mod.rs