[releng] Remove mirrors

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 8a93a2a0c5c7e95cd17ad1668b2844829ddeb632
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Feb 17 16:31:07 2020 -0600

    Remove mirrors
    
    The sftp code is complaining that something is wrong with
    sftp://master.gnomne.org. And I can't imagine how the window.gnome.org
    mirror is supposed to work. We can rely on download.gnome.org to be
    functioning.

 tools/smoketesting/tarball-conversion.config | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/tools/smoketesting/tarball-conversion.config b/tools/smoketesting/tarball-conversion.config
index e4ec4eb..dad9217 100644
--- a/tools/smoketesting/tarball-conversion.config
+++ b/tools/smoketesting/tarball-conversion.config
@@ -51,10 +51,6 @@
     <site module="udisks"                    location="https://udisks.freedesktop.org/releases/"/>
     <site module="uhttpmock"                 location="https://tecnocode.co.uk/downloads/uhttpmock/"/>
   </locations>
-  <mirrors>
-    <mirror location="https://download.gnome.org/"; alternate="file:///ftp/pub/GNOME/" 
host="window.gnome.org" />
-    <mirror location="https://download.gnome.org/"; alternate="sftp://master.gnome.org/ftp/pub/GNOME/"; />
-  </mirrors>
   <!-- Should we remove this functionality? Probably makes more sense to rename modules in BuildStream 
instead. -->
   <rename>
     <name old="gmime3"               new="gmime"/>