Make dist equivalent to old build system.
diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index 3e0cfa3..472bfaf 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -535,7 +535,7 @@
 
             builder.ensure(dist::DebuggerScripts {
                 sysroot: builder.sysroot(compiler),
-                target: target
+                host: target
             });
         }