Skip res_init test on macOS/iOS
Skip res_init test on macOS/iOS

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