Add CoreAudio support (#6270)

soh/soh/SohGui/MenuTypes.h

@@ -267,6 +267,7 @@ struct MainMenuEntry {
 static const std::map<Ship::AudioBackend, const char*> audioBackendsMap = {
     { Ship::AudioBackend::WASAPI, "Windows Audio Session API" },
     { Ship::AudioBackend::SDL, "SDL" },
+    { Ship::AudioBackend::COREAUDIO, "Core Audio" },
     { Ship::AudioBackend::NUL, "Null" },
 };
 

soh/soh/SohGui/SohGui.cpp

@@ -46,6 +46,9 @@ static const inline std::vector<std::pair<const char*, const char*>> audioBacken
 #endif
 #if defined(__linux)
     { "pulse", "PulseAudio" },
+#endif
+#ifdef __APPLE__
+    { "coreaudio", "Core Audio" },
 #endif
     { "sdl", "SDL Audio" }
 };