Use SDLK_PRINT instead of SDLK_SYSREQ.

stepmania/src/StepMania.cpp

@@ -754,7 +754,7 @@ bool HandleGlobalInputs( DeviceInput DeviceI, InputEventType type, GameInput Gam
 	 * Alt+PrntScrn.  Windows will do this whether or not we save a screenshot 
 	 * ourself by dumping the frame buffer.  */
 	// "if pressing PrintScreen and not pressing Alt"
-	if( DeviceI == DeviceInput(DEVICE_KEYBOARD, SDLK_SYSREQ) &&
+	if( DeviceI == DeviceInput(DEVICE_KEYBOARD, SDLK_PRINT) &&
 		!INPUTFILTER->IsBeingPressed( DeviceInput(DEVICE_KEYBOARD, SDLK_RALT)) &&
 		!INPUTFILTER->IsBeingPressed( DeviceInput(DEVICE_KEYBOARD, SDLK_LALT)) )
 #else

stepmania/src/arch/InputHandler/InputHandler_DirectInputHelper.cpp

@@ -281,7 +281,7 @@ static int ConvertScancodeToKey( int scancode )
 	case DIK_NUMPADENTER: return SDLK_KP_ENTER;
 	case DIK_RCONTROL: return SDLK_RCTRL;
 	case DIK_DIVIDE: return SDLK_KP_DIVIDE;
-	case DIK_SYSRQ: return SDLK_SYSREQ;
+	case DIK_SYSRQ: return SDLK_PRINT;
 	case DIK_RMENU: return SDLK_RALT;
 	case DIK_PAUSE: return SDLK_PAUSE;
 	case DIK_HOME: return SDLK_HOME;

stepmania/src/arch/InputHandler/InputHandler_SDL.cpp

@@ -89,6 +89,11 @@ void InputHandler_SDL::Update(float fDeltaTime)
 		case SDL_KEYUP:
 			{
 			DeviceInput di(DEVICE_KEYBOARD, event.key.keysym.sym);
+
+			/* SDL is inconsistent about this key: */
+			if( di.button == SDLK_SYSREQ )
+				di.button = SDLK_PRINT;
+
 			ButtonPressed(di, event.key.state == SDL_PRESSED);
 			}
 			continue;