We not only require libcheck but also needed to disable a few tests,
without providing the former, test cases were signalled as being run
successfully but weren't actually run.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
The GitHub repository has changed the name to "toxcore".
Also indented buildInputs/configureFlags a bit less messy.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>