Added linger struct

src/unix/bsd/apple/mod.rs

src/unix/bsd/freebsdlike/mod.rs

src/unix/bsd/openbsdlike/mod.rs

src/unix/notbsd/android/mod.rs

src/unix/notbsd/linux/mips.rs

src/unix/notbsd/linux/musl/b32/arm.rs

src/unix/notbsd/linux/musl/b32/asmjs.rs

src/unix/notbsd/linux/musl/b32/mips.rs

src/unix/notbsd/linux/musl/b32/x86.rs

src/unix/notbsd/linux/musl/b64/mod.rs

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

src/unix/solaris/mod.rs