Merge pull request #35 from xord/fix_compile_errors_with_core_audio

fix compile errors with -D__MACOSX_CORE__

RtAudio.cpp

@@ -1405,7 +1405,6 @@ void RtApiCore :: closeStream( void )
   }
 
   CoreHandle *handle = (CoreHandle *) stream_.apiHandle;
-  if ( stream_.mode == OUTPUT || stream_.mode == DUPLEX ) {
   if ( stream_.mode == OUTPUT || stream_.mode == DUPLEX ) {
     if (handle) {
       AudioObjectPropertyAddress property = { kAudioHardwarePropertyDevices,