* sparc64nbsd-tdep.c: Include "regset.h".

* sparc64nbsd-tdep.c: Include "regset.h".
(sparc64nbsd_sizeof_struct_reg, sparc64nbsd_sizeof_struct_fpreg):
Remove variables.
(fetch_core_registers): Remove function.
(sparc64nbsd_core_fns): Remove variable.
(sparc64nbsd_supply_gregset, sparc64nbsd_supply_fpregset): New
functions.
(sparc64nbsd_init_abi): Initialize TDEP->gregset,
TDEP->sizeof_gregset, TDEP->fpregset and TDEP->sizeof_gregset.
(_initialize_sparc64nbsd_tdep): Remove call to add_core_fns.