Switch to poll() to be safe against stack corruption from exceeding FD_SETSIZE

Fortunately, the fd_set definition is not prone to stack corruption on Windows,
because FD_SETSIZE is the maximum number of sockets in a fd_set, not
the maximum value socket file descriptor that can be stored in a fd_set.

https://beesbuzz.biz/code/5739-The-problem-with-select-vs-poll

src/PlatformSockets.h

@@ -29,6 +29,7 @@ typedef int SOCKADDR_LEN;
 #include <netdb.h>
 #include <errno.h>
 #include <signal.h>
+#include <poll.h>
 
 #define ioctlsocket ioctl
 #define LastSocketError() errno
@@ -59,6 +60,7 @@ int setNonFatalRecvTimeoutMs(SOCKET s, int timeoutMs);
 void setRecvTimeout(SOCKET s, int timeoutSec);
 void closeSocket(SOCKET s);
 int isPrivateNetworkAddress(struct sockaddr_storage* address);
+int pollSockets(struct pollfd* pollFds, int pollFdsCount, int timeoutMs);
 
 int initializePlatformSockets(void);
 void cleanupPlatformSockets(void);