libtoxcore: Update to latest Git master.

The GitHub repository has changed the name to "toxcore".
Also indented buildInputs/configureFlags a bit less messy.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
libtoxcore: Add libopus and libvpx to buildInputs.

Those are necessary to do audio/video calls, which I guess is the whole
point of the Tox project.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
libtoxcore: Enable and fix up running test suite.

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>
toxic: Update to latest upstream Git master.

Unfortunately they've changed their build system to be makefile-only and
they don't seem to include test cases in the CLI anymore, so we needed
to adapt accordingly. Also added freealut and openal to the buildInputs,
in order to allow audio support.

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