Don't fiddle with qemu in host-tools. Andre Ruiz noticed that we were checking $host_tools rather than $HOST_TOOLS so this hasn't worked in a while, but it was just a warning anyway. We can't compile qemu from source until TCG goes in and the gcc 3.x dependencies go away, and we're just using it as a smoke test anyway during this part of the build. So if it's not there, it's not there.

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