Auto merge of #1023 - bitrauser:master, r=brson
Auto merge of #1023 - bitrauser:master, r=brson

Remove error reporting from rustup-init.sh

In response to #987 I made rustup-init.sh terminate unsuccessfully instead of printing a message in case there is an error running rustup-init.exe.

inejge/rustup.rs,nodakai/rustup.rs,rust-lang/rustup,Boddlnagg/rustup.rs,Boddlnagg/rustup.rs,theindigamer/rustup.rs,rust-lang/rustup,inejge/rustup.rs,inejge/rustup.rs,nodakai/rustup.rs,Boddlnagg/rustup.rs,theindigamer/rustup.rs,rust-lang/rustup,nodakai/rustup.rs,theindigamer/rustup.rs,rust-lang/rustup,theindigamer/rustup.rs,inejge/rustup.rs,nodakai/rustup.rs,theindigamer/rustup.rs,nodakai/rustup.rs,Boddlnagg/rustup.rs,rust-lang/rustup,inejge/rustup.rs,Boddlnagg/rustup.rs