windows.hpp needs to be included before zmq.h

windows.hpp must be included first due to increases _WIN32_WINNT version

tests/test_timers.cpp

@@ -28,7 +28,6 @@
 */
 
 #include "macros.hpp"
-#include "testutil.hpp"
 
 #if defined ZMQ_HAVE_WINDOWS
 #include "windows.hpp"
@@ -36,6 +35,8 @@
 #include <unistd.h>
 #endif
 
+#include "testutil.hpp"
+
 void sleep_ (long timeout_)
 {
 #if defined ZMQ_HAVE_WINDOWS