Add socks to cpp library.

lib/cpp/mosquittopp.cpp

@@ -274,6 +274,12 @@ void mosquittopp::user_data_set(void *userdata)
 	mosquitto_user_data_set(m_mosq, userdata);
 }
 
+int mosquittopp::socks5_set(const char *host, int port, const char *username, const char *password)
+{
+	return mosquitto_socks5_set(m_mosq, host, port, username, password);
+}
+
+
 int mosquittopp::tls_set(const char *cafile, const char *capath, const char *certfile, const char *keyfile, int (*pw_callback)(char *buf, int size, int rwflag, void *userdata))
 {
 	return mosquitto_tls_set(m_mosq, cafile, capath, certfile, keyfile, pw_callback);

lib/cpp/mosquittopp.h

@@ -88,6 +88,7 @@ class mosqpp_EXPORT mosquittopp {
 		int loop_stop(bool force=false);
 		bool want_write();
 		int threaded_set(bool threaded=true);
+		int socks5_set(const char *host, int port=1080, const char *username=NULL, const char *password=NULL);
 		
 		virtual void on_connect(int rc) {return;};
 		virtual void on_disconnect(int rc) {return;};