support for 64bit fq-rate
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Description
Starting with Linux 5.x, fq pacing is now supported for speeds > 32G.
see: https://patchwork.ozlabs.org/project/netdev/patch/20190228231728.242461-2-edumazet@google.com/
and https://kernelnewbies.org/Linux_5.1
This change is needed in iperf3 to support this:
sed -i -e 's/unsigned int fqrate/uint64_t fqrate/g' -e 's/Setting fair-queue socket pacing to %u/Setting fair-queue socket pacing to %"PRIu64"/g' src/iperf_tcp.c src/iperf_udp.c
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