Windows: winsock2.h must be included before including windows.h

systemdeps.h

@@ -60,6 +60,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
 #if defined(_WIN32) && !defined(__CYGWIN__) && !defined(GNU_WIN32)
 
+    #ifdef __MINGW32__
+    #  include <winsock2.h> // mingw gives warning if we include windows.h before winsock2.h
+    #endif
+
     #include <windows.h>
 
     #ifdef _MSC_VER     /* Microsoft compiler */