rusti tests don't work on cross-compile builds

[brson]

http://buildbot.rust-lang.org/builders/dist-linux/builds/254/steps/test/logs/stdio

This is blocking the release so I'm going to disable them again.

[alexcrichton]

Just in case this sticks around for awhile, here's a snippet:

<anon>:21:16: 21:36 error: unresolved import: could not find `serialize` in `extra`.
<anon>:21             use extra::serialize::*;
                          ^~~~~~~~~~~~~~~~~~~~
<anon>:21:16: 21:36 error: failed to resolve import `extra::serialize::*`
<anon>:21             use extra::serialize::*;

Basically the crates aren't resolving correctly (probably using x86_64 versions or vice versa by some accident)

[huonw]

Triage: the link in the description is dead, and all the tests are #[ignore]'d on all platforms, and rusti is broken anyway.

I think this is out-of-date enough to close.