Beta testing rustup.rs

rustup 0.6.2 is out. Update with rustup self update.

This release primarily fixes a miscompilation bug that results in segfaults in rustup on multiple architectures in a variety of scenarios. The rustup build is currently pinned to nightly-2016-08-10, it’s not clear where the bug is, and there is no fix upstream yet.

0.6.2

Contributors: Brian Anderson, Diggory Blake, Knight, Marco A L Barbosa