Removed header file, that isn't documented as missing from the ios sdk.

JonathanHenson · JonathanHenson · commit 010fb4f53ba9 · 2017-02-14T12:44:04.000-08:00
diff --git a/aws-cpp-sdk-text-to-speech/include/aws/text-to-speech/apple/CoreAudioPCMOutputDriver.h b/aws-cpp-sdk-text-to-speech/include/aws/text-to-speech/apple/CoreAudioPCMOutputDriver.h
@@ -18,7 +18,6 @@
 #include <aws/text-to-speech/PCMOutputDriver.h>
 #include <aws/core/utils/memory/stl/AWSQueue.h>
 #include <aws/core/utils/Array.h>
-#include <CoreAudio.h>
 #include <AudioQueue.h>
 
 #include <mutex>
