Use legacy property syntax for Mono

Author: craigminihan

HttpWebClient.UnitTests/TestHttpWebClientRequest.cs

@@ -57,7 +57,7 @@ public TestSocket(string host, int port, int timeout, StringBuilder requestText,
  public bool NoDelay { get; set; }
  public bool ForceClose { protected get; set; }
 
- public IntPtr Handle => throw new NotImplementedException();
+ public IntPtr Handle { get { throw new NotImplementedException(); } }
 
  public void Close() { }
 
@@ -86,7 +86,7 @@ public int Send(byte[] buffer, int offset, int count, SocketFlags flags = Socket
  return count;
  }
 
- public string RequestText => _requestText.ToString();
+ public string RequestText { get { return _requestText.ToString(); } }
  }
 
  public TestHttpWebClientRequest()