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;

src/video/cocoa/SDL_cocoakeyboard.m

@@ -679,7 +679,7 @@ Cocoa_HandleKeyEvent(_THIS, NSEvent *event)
         SDL_SendKeyboardKey(SDL_PRESSED, code);
 #if 1
         if (code == SDL_SCANCODE_UNKNOWN) {
-            fprintf(stderr, "The key you just pressed is not recognized by SDL. To help get this fixed, report this to the SDL mailing list <sdl@libsdl.org> or to Christian Walther <cwalther@gmx.ch>. Mac virtual key code is %d.\n", scancode);
+            fprintf(stderr, "The key you just pressed is not recognized by SDL. To help get this fixed, report this to the SDL forums/mailing list <https://discourse.libsdl.org/> or to Christian Walther <cwalther@gmx.ch>. Mac virtual key code is %d.\n", scancode);
         }
 #endif
         if (SDL_EventState(SDL_TEXTINPUT, SDL_QUERY)) {

src/video/nacl/SDL_naclevents.c

@@ -314,7 +314,7 @@ SDL_NACL_translate_keycode(int keycode)
         scancode = NACL_Keycodes[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> NACL KeyCode %d \n", keycode);
+        SDL_Log("The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL forums/mailing list <https://discourse.libsdl.org/> NACL KeyCode %d", keycode);
     }
     return scancode;
 }

src/video/x11/SDL_x11events.c

@@ -775,7 +775,7 @@ X11_DispatchEvent(_THIS)
                 X11_XDisplayKeycodes(display, &min_keycode, &max_keycode);
                 keysym = X11_KeyCodeToSym(_this, keycode, xevent.xkey.state >> 13);
                 fprintf(stderr,
-                        "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> X11 KeyCode %d (%d), X11 KeySym 0x%lX (%s).\n",
+                        "The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL forums/mailing list <https://discourse.libsdl.org/> X11 KeyCode %d (%d), X11 KeySym 0x%lX (%s).\n",
                         keycode, keycode - min_keycode, keysym,
                         X11_XKeysymToString(keysym));
             }

src/video/x11/SDL_x11keyboard.c

@@ -380,7 +380,7 @@ X11_InitKeyboard(_THIS)
         SDL_Keycode keymap[SDL_NUM_SCANCODES];
 
         printf
-            ("Keyboard layout unknown, please send the following to the SDL mailing list (sdl@libsdl.org):\n");
+            ("Keyboard layout unknown, please report the following to the SDL forums/mailing list (https://discourse.libsdl.org/):\n");
 
         /* Determine key_layout - only works on US QWERTY layout */
         SDL_GetDefaultKeymap(keymap);