Allow specifying non default port for wxFTP connections.

Add a wxFTP::Connect() overload taking a port number.

Also specify the default port (21) explicitly if resolving "ftp" service name
failed.

Closes #12145.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64621 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/protocol/ftp.h

@@ -35,8 +35,9 @@ public:
     virtual ~wxFTP();
 
     // Connecting and disconnecting
-    bool Connect(const wxSockAddress& addr, bool wait = true);
-    bool Connect(const wxString& host);
+    virtual bool Connect(const wxSockAddress& addr, bool wait = true);
+    virtual bool Connect(const wxString& host) { return Connect(host, 0); }
+    virtual bool Connect(const wxString& host, unsigned short port);
 
     // disconnect
     virtual bool Close();