test: Try to work around a resolve1 bug in class-cast-to-iface-cross-crate-2

Author: pcwalton

src/test/run-pass/class-cast-to-iface-cross-crate-2.rs

@@ -1,7 +1,7 @@
 // xfail-fast
 // aux-build:cci_class_cast.rs
 use cci_class_cast;
-import to_str::*;
+import to_str::to_str;
 import cci_class_cast::kitty::*;
 
 fn print_out<T: to_str>(thing: T, expected: str) {