Avoid prototype checking for the call to os_ifconfig_line; not all images are up to date, so the version in the pgeni tarball would throw an error.
Avoid prototype checking for the call to os_ifconfig_line; not all
images are up to date, so the version in the pgeni tarball would throw
an error.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome