Hello,

This updates the GNU/Linux gregset code so that the supply and fill 
functions work 32x64.  In particular:

- implements the new regset_from_core_section
(replacing the older add_core_fns)

- fixes fill_gregset
(the new regset code, and more importantly BFD, will likely need changes 
before that works).

With this in place 32x64 GNU/Linux threaded programs become debuggable.

Ok? 6.1?

Andrew