fixed compiler warning due to missing function prototype

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index a4fc6fa09d0d6c6465606f2ef808c40e209e013e..2c8e116acf4025ab75f06e323806050b746d9d04 100644 (file)
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -38,7 +38,7 @@ void sge_Line(SDL_Surface *, Sint16, Sint16, Sint16, Sint16, Uint32);
 
 #if defined(USE_TOUCH_INPUT_OVERLAY)
 // functions to draw overlay graphics for touch device input
-static void DrawTouchInputOverlay();
+static void DrawTouchInputOverlay(void);
 #endif
 
 void SDLLimitScreenUpdates(boolean enable)