[racket] Ubuntu PPA update for 6.0.1

On 2014-05-09 14:39:20 -0400, Sam Tobin-Hochstadt wrote:
> It installed fine, but then when I tried to do `raco pkg install
> main-distribution-test` to run tests, bad things happened.
>
> [...]
>
> It still didn't work if I tried that require from the REPL, even
> though `raco pkg` thought that `eli-tester` was installed.

I think this may be a problem in the general release tarball rather than
anything specific to the PPA. I tried building v6.0.1 from the source
tarball and saw that eli-tester is installed, but the collection is not.

Cheers,
Asumu