AsyncIO.OpResults has unneeded reference to `IdWinsock2`

[edwinyzh]

I've just found this nice library and checking out the example, trying to compile the FileCopy sample, I got a compiler error saying that `IdWinsock2.pas' wasn't found, it turned out that file's not needed.

I'd also suggest to change the format of this source file to utf8 instead of ANSI otherwise your name in the first line of the unit file will become unreadable after saving it to disk in my locale.