Eduard-Mihai Burtescu 988831319e Rollup merge of #37265 - brson:bootstrap, r=alexcrichton
Allow bootstrapping without a key. Fixes #36548

This will make it easier for packagers to bootstrap rustc when they happen
to have a bootstrap compiler with a slightly different version number.

It's not ok for anything other than the build system to set this environment variable.

r? @alexcrichton
2016-10-19 08:00:04 +03:00
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