Fixed warning about redefining DECLSPEC

src/core/linux/SDL_fcitx.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "SDL_config.h"
+#include "../../SDL_internal.h"
 
 #ifdef HAVE_FCITX_FRONTEND_H