lmbench is a bit outdated tool to do OS performance analysis. The
upcoming neotest SR will use lat_tcp from this packages to measure TCP
round-trip-time latency.

We use a bit patched version with fixes to lat_tcp for errors not to go
unnoticed and also lat_tcp.go added to see how using Go compares to
plain lat_tcp.c for latencies.

In the upcoming neotest SR both lat_tcp C & Go versions will be used to
automatically benchmark TCP round-trip-times over network link in between
2 machines.