Changed messages about not recognized keys to include discourse link.

src/core/linux/SDL_evdev.c

@@ -398,8 +398,8 @@ SDL_EVDEV_translate_keycode(int keycode)
 
     if (scancode == SDL_SCANCODE_UNKNOWN) {
         SDL_Log("The key you just pressed is not recognized by SDL. To help "
-            "get this fixed, please report this to the SDL mailing list "
-            "<sdl@libsdl.org> EVDEV KeyCode %d\n", keycode);
+            "get this fixed, please report this to the SDL forums/mailing list "
+            "<https://discourse.libsdl.org/> EVDEV KeyCode %d", keycode);
     }
 
     return scancode;