rustc: XFAIL use.rs too. Should put out burning tinderbox.

Author: pcwalton

Makefile.in

@@ -696,6 +696,7 @@ TEST_XFAILS_STAGE0 := $(FLOAT_XFAILS) \
                         threads.rs \
                         type-sizes.rs \
                         typestate-cfg-nesting.rs \
+						use.rs \
                         use-import-export.rs \
                         user.rs \
                         utf8.rs \