Nmap's changes have been moved from the NMAP_MODIFICATIONS file to the
Github repo at https://github.com/nmap/libdnet
The NMAP_MODIFICATIONS file instead will document only the changes made
to strip unused parts of the libdnet source prior to inclusion in Nmap.
This is set to an empty string in all functions yielding routes,
particularly route_loop. The code to get the interface pertaining to a
route is different on different platforms, so must be added one by one.
The code setting the intf_name to an empty string is only tested on
Linux.
