Win wsa select event (#342)

* Fix #323: Missing SelectInterrupt implementation for Windows

Using WSAEventSelect, WSAWaitForMultipleEvents and WSAEnumNetworkEvents to emulate poll() with an interrupt-event.

* Cleanup

* Fixed incomplete comment.

* Switched ifdefs to support other Unixes with pipe file descriptors

* Fixed: SelectInterrupt fallback code for getFd()==-1 && getEvent()==nullptr converted a PollResultType::Timeout into a ReadyForRead causing the HttpClient to fail because it uses a hard-coded "SelectInterrupt" instance that doesn't implement getFd() and getEvent().

* Fixed gcc compile errors

* - HttpClient now uses the SelectInterruptFactory
- Fixed wrong ix::poll result when using Windows WSA functions

* We must deselect the networkevents from the socket event. Otherwise the socket will report states that aren't there.

ixwebsocket/IXSocketConnect.cpp

@@ -20,6 +20,7 @@
 #include <linux/in.h>
 #include <linux/tcp.h>
 #endif
+#include <ixwebsocket/IXSelectInterruptFactory.h>
 
 namespace ix
 {
@@ -66,7 +67,7 @@ namespace ix
 
             int timeoutMs = 10;
             bool readyToRead = false;
-            auto selectInterrupt = ix::make_unique<SelectInterrupt>();
+            SelectInterruptPtr selectInterrupt = ix::createSelectInterrupt();
             PollResultType pollResult = Socket::poll(readyToRead, timeoutMs, fd, selectInterrupt);
 
             if (pollResult == PollResultType::Timeout)