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When we do a build inside one of the BSD VMs, first delete any stale old build directories from the VM's /var/tmp. This prevents the VM from running out of disk space after it has been used for a dozen or so builds. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20180820124811.7982-1-peter.maydell@linaro.org