Catch up to recentish kgdb changes: - Use ptid_get_pid() rather than ptid_get_tid() (part of the changes to   let 'tid' work for remote kgdb). - Add a stub kgdb_trgt_new_objfile() hook.
Catch up to recentish kgdb changes:
- Use ptid_get_pid() rather than ptid_get_tid() (part of the changes to
  let 'tid' work for remote kgdb).
- Add a stub kgdb_trgt_new_objfile() hook.

Silence from:	obrien, mips@

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase