Fix various CI errors in PR #449

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/netbsdlike/netbsd/mod.rs

src/unix/mod.rs

src/unix/notbsd/mod.rs