Allow building against OpenSSL without SSLv2 support.

--- src/gui_common.c.orig	Fri Jun 22 20:20:31 2012
+++ src/gui_common.c	Fri Jun 22 20:25:31 2012
@@ -2354,11 +2354,13 @@ static void cfgtab_ssl(GtkWidget * notebook)
   gtk_container_add(GTK_CONTAINER(ptab), rb);
   gui_cfg.ssl_version[0] = rb;
 
+#ifndef OPENSSL_NO_SSL2
   rb = gtk_radio_button_new_with_label(rg, gettext("SSLv2"));
   rg = gtk_radio_button_group(GTK_RADIO_BUTTON(rb));
   gtk_widget_show(rb);
   gtk_container_add(GTK_CONTAINER(ptab), rb);
   gui_cfg.ssl_version[1] = rb;
+#endif
 
   rb = gtk_radio_button_new_with_label(rg, gettext("SSLv3"));
   rg = gtk_radio_button_group(GTK_RADIO_BUTTON(rb));