Remove unused variable warning from Emscripten build in Emscripten_HandleFullscreenChange().
diff --git a/src/video/emscripten/SDL_emscriptenevents.c b/src/video/emscripten/SDL_emscriptenevents.c
index f474689..ca24fe0 100644
--- a/src/video/emscripten/SDL_emscriptenevents.c
+++ b/src/video/emscripten/SDL_emscriptenevents.c
@@ -507,7 +507,6 @@
     SDL_WindowData *window_data = userData;
     if(fullscreenChangeEvent->isFullscreen)
     {
-        SDL_bool is_desktop_fullscreen;
         window_data->window->flags |= window_data->requested_fullscreen_mode;
 
         window_data->requested_fullscreen_mode = 0;