main/kernel-scripts: remove
This package was a workaround for out-of-tree modules (wireguard). We have dropped the wireguard kernel module package already, and since kernel-scripts is failing to build now (it would need to be updated), let's drop it as well.
If somebody wants to bring back and maintain the wireguard out-of-tree kernel module, I've documented how we had done it here: https://wiki.postmarketos.org/wiki/Out-of-tree_kernel_modules
I'll test that the kernels are still building, and then merge this.
This removes one package from the "FIXME" list of https://gitlab.com/postmarketOS/build.postmarketos.org/issues/13.