Turn off Nagle algorithm to decrease latency.

This is safe because of the way writes are performed: for each transmission,
all outgoing messages are concatenated in memory and only a single write()
syscall is made.

src/tcpsockets/TCPStream.h

@@ -53,6 +53,7 @@ class TCPStream : public NetworkStream {
 
   llvm::StringRef getPeerIP() const override;
   int getPeerPort() const override;
+  void setNoDelay() override;
 
   TCPStream(const TCPStream& stream) = delete;
   TCPStream& operator=(const TCPStream&) = delete;