Add mac plattform detection from rustup.rs#855
Add mac plattform detection from rustup.rs#855

starsep/rust-www,ituxbag/rust-www,AndrewBrinker/rust-www,AndrewBrinker/rust-www,ituxbag/rust-www,starsep/rust-www,AndrewBrinker/rust-www,ituxbag/rust-www,starsep/rust-www,AndrewBrinker/rust-www,ituxbag/rust-www,ituxbag/rust-www,AndrewBrinker/rust-www,ituxbag/rust-www,AndrewBrinker/rust-www,starsep/rust-www,starsep/rust-www,starsep/rust-www