broken download pages for mirrored releases

[Rick Hillegas]

Download machinery is broken for the two mirrored releases (10.15.2.0 
and 10.14.2.0), that is, the ones with cgi scripts. Before asking INFRA 
for advice on what has changed, I thought that I would ask derby-dev 
first. Does anyone have a theory about what has changed and broken the 
download machinery for our flagship releases? See 
https://issues.apache.org/jira/browse/DERBY-7093

Thanks,
-Rick