I am cross-compiling and the target only supports select.
How can I force asyncnet to always use select at the lower layer?
Logic is here: https://github.com/nim-lang/Nim/blob/6ab532fd0f4cbe81f00b01a7e0720e3650375929/lib/pure/selectors.nim#L345
Either select an appropriate OS. Alternatively define lwip or nimIoselector.