fix: SLIC3R_PCH=OFF now builds on Windows, allowing compiler caching (#15552)

src/slic3r/Utils/Bonjour.hpp

@@ -115,6 +115,7 @@ class UdpSession
 {
 public:
 	UdpSession(Bonjour::ReplyFn rfn);
+	virtual ~UdpSession() = default;
 	virtual void handle_receive(const boost::system::error_code& error, size_t bytes) = 0;
 	std::vector<char>				buffer;
 	boost::asio::ip::udp::endpoint	remote_endpoint;