Drop apparently unneeded include of winsock2.h

Commit d08bae3d ("Implement target async for Windows") unconditionally
includes winsock2.h.  We don't want to do that on Cygwin, since
including both winsock2.h and sys/select.h causes incompatible
redefinition problems.

Since that include is apparently unneeded, just drop it.

Fixes: d08bae3d
1 file changed