* ppcnbsd-tdep.h: Update copyright year. Include <stddef.h>

* ppcnbsd-tdep.h: Update copyright year.  Include <stddef.h>
(ppcnbsd_supply_reg, ppcnbsd_fill_reg, ppcnbsd_supply_fpreg)
(ppcnbsd_fill_fpreg): Remove prototypes.
(struct regset): Add forward declaration.
(ppcnbsd_gregset, ppcnbsd_fpregset): Extern declarations.
* ppcnbsd-tdep.c: Update copyright year.  Include "gdbtypes.h",
"regset.h" and "gdb_string.h".  Don't include "breakpoint.h",
"value.h", target.h and nbsd-tdep.h".  Reorder includes.
(REG_FIXREG_OFFSET, REG_LR_OFFSET, REG_CR_OFFSET, REG_XER_OFFSET)
(REG_CTR_OFFSET, REG_PC_OFFSET, SIZEOF_STRUCT_REG)
(FPREG_FPR_OFFSET, FPREG_FPSCR_OFFSET, SIZEOF_STRUCT_FPREG):
Remove macros.
(ppcnbsd_supply_reg, ppcnbsd_fill_reg, ppcnbsd_supply_fpreg)
(ppcnbsd_fill_fpreg): Remove functions.
(fetch_core_registers, fetch_elfcore_registers): Remove functions.
(ppcnbsd_core_fns, ppcnbsd_elfcore_fns): Remove variables.
(ppcnbsd_reg_offsets): New variable.
(ppcnbsd_gregset, ppcnbsd_fpregset): New variables.
(ppcnbsd_sigtramp_cache_init): Deal with new signal trampoline
introduced in NetBSD 2.0.
(ppcnbsd_sigtramp): Provide complete signal trampoline.
(ppcnbsd2_sigtramp): New variable.
(ppcnbsd_init_abi): Set svr4_fetch_link_map_offsets to
svr4_ilp32_fetch_link_map_offsets.  Set regset_from_core_section.
Add ppcnbs2_sigtramp unwinder.
(_initialize_ppcnbsd_tdep): Don't use deprecated_add_core_fns.
Initialize ppcnbsd_reg_offsets.
* ppcnbsd-nat.c: Update copyright year.  Reorder includes.
(getregs_supplies): Use regnum instead of regno.
(getfpregs_supplies): Likewise.
(ppcnbsd_fetch_inferior_registers): Likewise.  Call
ppc_supply_gregset and ppc_suppply_fpregset instead of
ppcnbsd_supply_reg and ppcnbsd_supply_fpreg
(ppcnbsd_store_inferior_registers): Likewise.  Call
ppc_collect_gregset and ppc_collect_fpregset instead of
ppcnbsd_fill_reg and ppcnbsd_fill_fpreg.
(ppcnbsd_supply_pcb): Use `gdb_byte *' instead of `char *'.
(_initialize_ppcnbsd_nat): Add some whitespace.
* Makefile.in (ppcnbsd-nat.o, ppcnbsd-tdep.o): Update dependencies.
* config/powerpc/nbsd.mh (NATDEPFILES): Remove infptrace.o.
(NAT_FILE): Remove.
* config/powerpc/nbsd.mt (TDEPFILES): Remove nbsd-tdep.o.