Merge pull request #1587 from Susurrus/termios_breaks_consts

src/unix/bsd/apple/mod.rs

src/unix/bsd/freebsdlike/mod.rs

src/unix/bsd/mod.rs

src/unix/linux_like/linux/gnu/b32/mod.rs

src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs

src/unix/linux_like/linux/gnu/b64/mips64/mod.rs

src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs

src/unix/linux_like/linux/gnu/b64/s390x.rs

src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs

src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs

src/unix/linux_like/linux/musl/b32/hexagon.rs

src/unix/linux_like/linux/musl/mod.rs