bors 74b3684d00 Auto merge of #32895 - alexcrichton:rustbuild-beta, r=brson
rustbuild: Fix handling of the bootstrap key

Bring the calculation logic in line with the makefiles and also set the
RUSTC_BOOTSTRAP_KEY environment variable to enable the bootstrap on the stable
compiler.
2016-04-15 04:10:11 -07:00
..
2016-03-08 13:44:14 -08:00