test: Make zip-same-length no longer rely on resolve not handling shadowed modules properly

src/test/run-pass/zip-same-length.rs

@@ -3,8 +3,7 @@
 use std;
 import uint;
 import u8;
-
-import vec::*;
+import vec::{head, is_not_empty, last, same_length, zip};
 
 fn enum_chars(start: u8, end: u8) -> [char] {
     assert start < end;