win32 app_tminterval function

from songdongsheng@live.cn
support setting non-blocking IO on sockets in Windows

from songdongsheng@live.cn
call WSAStartup as needed on Windows

WSACleanup on the other hand is a relic of Windows 3.1. We can
take the memory hit not supporting dynamically unloading the network
stack from the process.

initialize the network support in openssl(1) (sigh)
update testssl to deal with .exe binary suffixes