[pypy-issue] Issue #2744: missing win32 functions in _multiprocessing (pypy/pypy)

[mattip]

New issue 2744: missing win32 functions in _multiprocessing
https://bitbucket.org/pypy/pypy/issues/2744/missing-win32-functions-in

mattip:

send, recv, closesocket are missing from the module

simple test: 
```
from multiprocessing import Pool
 
def f(x):
    return x*x
 
if __name__ == '__main__':
    with Pool(5) as p:
        print(p.map(f, [1, 2, 3]))
 
```