Fixed bug 3517 - Compiler warnings with gcc -Wstrict-prototypes

felix

Compiling even a simple SDL2 'hello world' program with gcc -Wstrict-prototypes (GCC 6.2.1) results in warnings like:

/usr/include/SDL2/SDL_gamecontroller.h:143:1: attention : function declaration isn't a prototype [-Wstrict-prototypes]
 extern DECLSPEC int SDLCALL SDL_GameControllerNumMappings();
 ^~~~~~

It seems there is a missing 'void' between the parentheses.

src/core/linux/SDL_fcitx.c

@@ -535,7 +535,7 @@ SDL_Fcitx_UpdateTextRect(SDL_Rect *rect)
 }
 
 void
-SDL_Fcitx_PumpEvents()
+SDL_Fcitx_PumpEvents(void)
 {
     SDL_DBusContext *dbus = fcitx_client.dbus;
     DBusConnection *conn = dbus->session_conn;