mozilla/rust — pull request #11407 by alexcrichton (2014-01-08 16:19:28+00:00)
Title: Fix the snapshot and cross compilation

If we bootstrap a cross compile from a stage1 compiler, then the stage1 compiler
already knows about the rustc => rustlib change, so we need to not add the extra
flag if it's a stage0 version of a target from a stage1 of another target.