[Bug-wget] Last modified dates from archive.org's Wayback Machine

[Gregory R Fellow]

Hi. I greatly appreciate that wget is able to store the last modified 
date and time when sites make that information available. For the 
Wayback Machine on archive.org the last modified information is provided 
in the "X-Archive-Orig-last-modified" field instead of the usual 
"Last-Modified" field. If you can consider adding support for this in 
the future that would be very helpful.

Thank you very much for your time and for making wget.

Greg Fellow