reverted removal of DOTNET_FX check in editor.

Author: StephenHodgson

Assets/HoloToolkit/Input/Tests/Scripts/MicStreamDemo.cs

@@ -122,7 +122,8 @@ private static void CheckForErrorOnCall(int returnCode)
             MicStream.CheckForErrorOnCall(returnCode);
         }
 
-        // Deal with all the ways that we could suspend our program in as few lines as possible
+#if DOTNET_FX
+        // On device, deal with all the ways that we could suspend our program in as few lines as possible.
         private void OnApplicationPause(bool pause)
         {
             CheckForErrorOnCall(pause ? MicStream.MicPause() : MicStream.MicResume());
@@ -142,5 +143,6 @@ private void OnEnable()
         {
             OnApplicationPause(false);
         }
+#endif
     }
 }