"use std" before #[link(...)] in .rc file causes an error

rustc errors out when compiling a ".rc" file if `use std` comes before the `#link(...)`:

test:rc

```
use std;

#[link(name="test", vers="0.1")];

mod test;
```

test.rs:

```
fn main() {}
```

Errors with:

```
test.rc:3:32: 3:33 error: expecting mod, found ;
test.rc:3 #[link(name="test", vers="0.1")];
```
