* i386nbsd-tdep.c: Don't include "gdbtypes.h". Include

* i386nbsd-tdep.c: Don't include "gdbtypes.h".  Include
"gdb_assert.h" and "gdb_string.h".
(i386nbsd_r_reg_offset): Rename from regmap.
(SIZEOF_STRUCT_REG): Remove.
(i386nbsd_supply_reg, fetch_core_registers,
fetch_elfcore_registers, i386nbsd_core_fns, i386nbsd_elfcore_fns):
Remove.
(i386nbsd_aout_supply_regset,
i386nbsd_aout_regset_from_core_section): New functions.
(i386nbsd_sc_reg_offset): Don't explicitly specify size of array.
(i386nbsd_init_abi): Initialize TDEP->gregset_reg_offset,
TDEP->gregset_num_regs amd sizeof_gregset.  Use ARRAY_SIZE to
initialize TDEP->sc_num_regs.
(i386nbsdaout_init_abi): New function.
(i386nbsdelf_init_abi): Remove initialization of
TDEP->num_xmm_regs.  Don't set num_regs here.
(_initialize_i386nbsd_tdep): Don't call add_core_fns.  Use
i386nbsd_aout_init to register NetBSD a.out OS/ABI.