Support other architectures than i386 and amd64

In tasks/install-compile-tools.yml, the Go compiler is only downloaded for i386 and amd64 architectures.

Additionally, the host architecture is determined by the userspace word width and not the CPU architecture.
It may be better to base the package name on ansible_architecture - in that case the playbook would fail for unknown CPU architectures. This is much better than trying to run i386 binaries on an ARM CPU, for example.