Add dirfd on netbsd
Add dirfd on netbsd

mneumann/libc,rust-lang/libc,rust-lang/libc,rust-lang-nursery/libc,rust-lang/libc,rust-lang-nursery/libc,cactorium/libc,mneumann/libc,cactorium/libc,rust-lang-nursery/libc,cactorium/libc,mneumann/libc