[rubygems/rubygems] Cleanup after testing `rake package`

Sometimes it happens to me that my local tests start failing because I
pull some file removals or renames into my local copy, and those are
still present on my last copy of pkg/. In those cases, the test about
`rake package` will fail with something like the following:

````

Failure:
TestRakePackage#test_builds_ok [/home/deivid/Code/rubygems/test/rubygems/test_rake_package.rb:13]:
Expected `rake package` to work, but got errors:

```
cd pkg/rubygems-update-3.1.0.pre1
WARNING:  See http://guides.rubygems.org/specification-reference/ for help
rake aborted!
Gem::InvalidSpecificationException: ["test/rubygems/test_rake_package.rb"] are not files

Tasks: TOP => package => gem => pkg/rubygems-update-3.1.0.pre1.gem
(See full trace by running task with --trace)

 ```

If you have added or removed files, make sure you run `rake update_manifest` to update the `Manifest.txt` accordingly.
Expected: true
  Actual: false
````

So, make sure, package is always built from scratch.

https://github.com/rubygems/rubygems/commit/4e2cc9eb26

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