feat: Remove build-host.sh as it is no longer used

Merged David Runge requested to merge dvzrv/arch-boxes:dvzrv/remove_build_host_script into master

The use of build-host.sh has been removed in 3bda5b26. In the case a script is needed to run build-inside-vm.sh in such an environment again, it is advised to rely on https://gitlab.archlinux.org/archlinux/ci-scripts/ instead.

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