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linux: add HWLOC_USE_NUMA_DISTANCES envvar to disable new node locali…
…ty heuristics 1) Some SLIT tables are buggy for NVDIMMs nodes (asymmetric and wrong). 2) Current Linux kernels (at least up to 5.3) may create conflicting node target/initiators when proximity domains and OS node indexes are different (e.g. when PXM 0 and 1 in CPU0 are nodes 0 and 2 in Linux on dual-CLX platforms in SNC mode). This envvar will allow working around such hardware/software bugs. By default, the envvar is 7, which means SLIT is gathered and (1) and (2) are enabled. Removing bit 0 disables SLIT entirely. Removing bit 1 disables (1). Removing bit 2 disables (2). Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
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