Update SDL2 to the latest hg revision of 2.0.4.

libs/SDL2/src/events/SDL_events.c

@@ -649,4 +649,10 @@ SDL_SendSysWMEvent(SDL_SysWMmsg * message)
     return (posted);
 }
 
+int
+SDL_SendKeymapChangedEvent(void)
+{
+    return SDL_SendAppEvent(SDL_KEYMAPCHANGED);
+}
+
 /* vi: set ts=4 sw=4 expandtab: */

libs/SDL2/src/events/SDL_events_c.h

@@ -38,6 +38,7 @@ extern void SDL_QuitInterrupt(void);
 
 extern int SDL_SendAppEvent(SDL_EventType eventType);
 extern int SDL_SendSysWMEvent(SDL_SysWMmsg * message);
+extern int SDL_SendKeymapChangedEvent(void);
 
 extern int SDL_QuitInit(void);
 extern int SDL_SendQuit(void);