pygame: Fix build with multiple outputs

The config.py script doesn't seem to cope very well with symlinks, so
let's pass it the right derivation outputs wherever possible and fall
back to drv.out.

I've disabled the tests because they somehow now seem to cause the build
to fail even though the tests failed *before* the merge of the
closure-size branch, but the whole build didn't fail regardless.

Here is a build from before the closure-size branch merge:

http://hydra.nixos.org/build/34367296



If you have a look at the build log, you already see a bunch of failing
tests (to be exact: the same set of tests that are failing now with the
fix of the preConfigure phase).

Other than that, the build now succeeds on my machine.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>