[beta] Use time crate in bootstrap dist instead of date#48118

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onur wants to merge 2 commits intorust-lang:betafrom onur:backport-48013

Commits on Feb 10, 2018

Use time crate in bootstrap dist instead of date
onur
committed

Commits on Feb 11, 2018

ignore-musl to save up some space, see rust-lang#48118
onur
committed