update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/src/audio/emscripten/SDL_emscriptenaudio.c

@@ -23,10 +23,8 @@
#if SDL_AUDIO_DRIVER_EMSCRIPTEN

#include "SDL_audio.h"
#include "SDL_log.h"
#include "../SDL_audio_c.h"
#include "SDL_emscriptenaudio.h"
#include "SDL_assert.h"

#include <emscripten/emscripten.h>