overrides: Update kernel source to v3.12.0-rc2.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Use synergy module instead of sessionCommands.

Haven't noticed that we already have a service module for synergy, so
let's use it instead of just executing the client/server on X session
initialization.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
overrides: Update kernel source to v3.12.0-rc6.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
common: Fix path to VirtualBox program module.

This is needed to cope with the nixos -> nixpkgs merge.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
common: Enable S3TC by default in xserver.

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