Display security state when asking for password

Indicate to the user how secure the transport channel is so they
can avoid entering their password for untrusted sites.
diff --git a/common/rfb/UserPasswdGetter.h b/common/rfb/UserPasswdGetter.h
index 18b0bae..13493e4 100644
--- a/common/rfb/UserPasswdGetter.h
+++ b/common/rfb/UserPasswdGetter.h
@@ -24,7 +24,7 @@
     // dialog, getpass(), etc.  The user buffer pointer can be null, in which
     // case no user name will be retrieved.  The caller MUST delete [] the
     // result(s).
-    virtual void getUserPasswd(char** user, char** password)=0;
+    virtual void getUserPasswd(bool secure, char** user, char** password)=0;
   };
 }
 #endif