usb: Use less transfers for multi-Kinect setup

Windows can only poll() 64 fds at once.

Author: xlz

src/libfreenect2.cpp

@@ -659,9 +659,15 @@ bool Freenect2DeviceImpl::open()
   unsigned ir_pkts_per_xfer = 8;
   unsigned ir_num_xfers = 60;
 
-#ifdef __APPLE__
+#if defined(__APPLE__)
   ir_pkts_per_xfer = 128;
   ir_num_xfers = 4;
+#elif defined(_WIN32) || defined(__WIN32__) || defined(__WINDOWS__)
+  // For multi-Kinect setup, there is a 64 fd limit on poll().
+  rgb_xfer_size = 1048576;
+  rgb_num_xfers = 3;
+  ir_pkts_per_xfer = 64;
+  ir_num_xfers = 8;
 #endif
 
   const char *xfer_str;