Fixed compilation on mingw32.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403228

src/joystick/win32/SDL_dxjoystick.c

@@ -38,6 +38,7 @@
 #include "SDL_joystick.h"
 #include "../SDL_sysjoystick.h"
 #include "../SDL_joystick_c.h"
+#define INITGUID /* Only set here, if set twice will cause mingw32 to break. */
 #include "SDL_dxjoystick_c.h"
 
 

src/joystick/win32/SDL_dxjoystick_c.h

@@ -37,7 +37,6 @@
 #include <windows.h>
 
 #define DIRECTINPUT_VERSION 0x0700      /* Need version 7 for force feedback. */
-#define INITGUID
 #include <dinput.h>