Remove qemu-common as a dep from qemu-user-static
    
    qemu-common has a dep on python, and has nothing that is critical for
    the operation of the userspace emulators. At most the qemu-trace-stap
    tool is useful, but we shouldn't force install of qemu-common just for
    that. qemu-user-static needs to be lightweight as its used to support
    cross-arch execution in scenarios where container/image size matters.
    
    In dropping qemu-common as a dep, we just need to ensure we still have
    the license files present.
    
    Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>