adds iOS audio interruption handling and recovery

src/modules/audio/null/Audio.cpp

@@ -203,6 +203,15 @@ bool Audio::isEFXsupported() const
 	return false;
 }
 
+void Audio::pauseContext()
+{
+}
+
+void Audio::resumeContext()
+{
+}
+
+
 } // null
 } // audio
 } // love

src/modules/audio/null/Audio.h

@@ -86,6 +86,9 @@ public:
 	int getMaxSourceEffects() const;
 	bool isEFXsupported() const;
 
+	void pauseContext();
+	void resumeContext();
+
 private:
 	float volume;
 	DistanceModel distanceModel;