windows boost-1.38 build fix

ChangeLog

@@ -31,6 +31,7 @@
 release 0.14.3
 
 	* added python binding for create_torrent
+	* fixed boost-1.38 build
 
 release 0.14.2
 

include/libtorrent/file.hpp

@@ -41,6 +41,10 @@ POSSIBILITY OF SUCH DAMAGE.
 #pragma warning(push, 1)
 #endif
 
+#ifdef WIN32
+#include <windows.h>
+#endif
+
 #include <boost/noncopyable.hpp>
 #include <boost/filesystem/path.hpp>