use upstream rustup init script download workaround for old curl version on CentOS6 #7619
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Problem
See #7615, where we had to work around a sudden error downloading rustup on our CentOS6 docker image bootstrap shards. A workaround was made available from rustup via rust-lang/rustup#1803, so we can remove our own workaround.
Solution
bootstrap_rust.sh
.rustup-init
script to a temporary file.Result
Our bootstrap shards should continue working!