util: Don't link host-utils.o if it's empty
Reported-by: NPeter Maydell <peter.maydell@linaro.org> Tested-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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