numa: remove stale node_has_online_mem() define
This isn't used anywhere, so delete it. Looks like the last usage (in x86-specific code) was removed by Tejun in 2011 in commit bd6709a9 ("x86, NUMA: Make 32bit use common NUMA init path"). Signed-off-by:Chris Metcalf <cmetcalf@ezchip.com>
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1bb50cad
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