The last of the issues we found while catching up with top-of-tree elf2tab...

The logic that gathers relocation data and places it at the end of the file ends up also emitting the data in place, which results in relocations being in the file twice.

My fix is a bit ugly, basically skipping segments that only have relocation data in them. I believe it should generally work, unless some configurations end up combining relocations with other data in the same segment?