Finish Windows ARM64 bringup

SDL2  for ARM64 is not yet checked-in, but I will do that when SDL 2.0.14 is released.

app/main.cpp

@@ -23,7 +23,7 @@
 #include "streaming/video/ffmpeg.h"
 #endif
 
-#if defined(Q_OS_WIN32)
+#if defined(Q_OS_WIN32) && defined(Q_PROCESSOR_X86)
 #include "antihookingprotection.h"
 #elif defined(Q_OS_LINUX)
 #include <openssl/ssl.h>

app/streaming/audio/renderers/sdlaud.cpp

@@ -42,7 +42,7 @@ bool SdlAudioRenderer::prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATION*
         return false;
     }
 
-    m_AudioBuffer = malloc(m_FrameSize);
+    m_AudioBuffer = SDL_malloc(m_FrameSize);
     if (m_AudioBuffer == nullptr) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                      "Failed to allocate audio buffer");
@@ -74,7 +74,7 @@ SdlAudioRenderer::~SdlAudioRenderer()
     }
 
     if (m_AudioBuffer != nullptr) {
-        free(m_AudioBuffer);
+        SDL_free(m_AudioBuffer);
     }
 
     SDL_QuitSubSystem(SDL_INIT_AUDIO);