Merge branch 'tiagogomes/disable-https-gnu-repo' into 'master'

Use http instead of https for the gnu ftp mirror

See merge request !676

doc/examples/autotools/project.conf

@@ -10,4 +10,4 @@ element-path: elements
 # Define some aliases for the tarballs we download
 aliases:
   alpine: https://gnome7.codethink.co.uk/tarballs/
-  gnu: https://ftpmirror.gnu.org/gnu/automake/
+  gnu: http://ftpmirror.gnu.org/gnu/automake/