WIP: attempt to workaround TCP_NODELAY error on winsock #496

Job	Run time
Linux centos 7	1m 40s
Native Linux (WError)	4m 59s
Linux fedora latest	4m 34s
Native Linux (libc++ debug)	5m 19s
Native Linux (c++17)	5m 4s
Cross mingw64 DLL	9m 59s
Cross mingw64 static	11m 1s
RTEMS5	13m 39s
Native Linux with clang	4m 50s
Native Linux with clang ubsan	5m 3s
Native Linux with libevent stable	5m 8s
Native Linux with 7.0.2	4m 53s
Native Linux with 3.15	3m 46s
Native Linux with 3.14	6m 27s
OSX	10m 7s
vs2019 DLL	7m 55s
vs2019 static	8m 28s
	1h 52m 52s

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