I have changed the way 3rd party modules works a bit. Now we need to
specify the _kver and _kpkgrel in every module package.
This is so we can build the packages in chroot where we don't have the
entire aports tree. This is a step in that direction.
This also means that every time we rebuild the kernel we need to
manually change all the 3rd party modules' APKBUILD too.
I'm not sure if we should split the commits or if we should use one
commit for kernel and all subpackages. Probably we should split it.
We'll see how it goes.