Win32 tests and timeout fix (#776)

Unit tests in Windows and a Windows timeout fix

This commit gets our unit tests compiling and running on Windows as well as removes a duplicated `timeval` -> `DWORD` conversion logic in sockcompat.c 

There are minor differences in behavior between Linux and Windows to note:

1.  In Windows, opening a non-existent hangs forever in WSAPoll whereas
    it correctly returns with a "Connection refused" error on Linux.
    For that reason, I simply skip this test in Windows.

    It may be related to this known issue:
    https://daniel.haxx.se/blog/2012/10/10/wsapoll-is-broken/

2.  Timeouts are handled slightly differently in Windows and Linux.  
    In Linux, we intentionally set REDIS_ERR_IO for connection
    timeouts whereas in Windows we set REDIS_ERR_TIMEOUT.  It may be
    prudent to fix this discrepancy although there are almost certainly
    users relying on the current behavior.

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