libusbemu: include winsock.h

MSVC needs struct timeval from winsock.h to support freenect_process_events_timeout.

Signed-off-by: Drew Fisher <drew.m.fisher@gmail.com>

Author: zarvox

platform/windows/libusb10emu/libusb-1.0/libusb.h

@@ -39,6 +39,8 @@
 #if defined(_MSC_VER)
   typedef unsigned __int8   uint8_t;
   typedef unsigned __int16  uint16_t;
+  // We need struct timeval.
+  #include <winsock.h>
 #else
 #include <stdint.h>
 #endif