winmm: Add a WARNing when winejoystick.drv is missing.

Signed-off-by: Serge Gautherie <winehq-git_serge_180711@gautherie.fr>
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/winmm/joystick.c

@@ -79,6 +79,8 @@ static	BOOL JOY_LoadDriver(DWORD dwJoyID)
 
     if (!JOY_Sticks[dwJoyID].hDriver)
     {
+        WARN("OpenDriverA(\"winejoystick.drv\") failed\n");
+
         /* The default driver is missing, don't attempt to load it again */
         winejoystick_missing = TRUE;
     }