* ppcobsd-nat.c: Update copyright year. Include "inf-ptrace.h".

* ppcobsd-nat.c: Update copyright year.  Include "inf-ptrace.h".
(ppcobsd_fetch_registers): Renamed from fetch_inferior_registers;
made static.
(ppcobsd_store_registers): Renamed from store_inferior_registers;
made static.
(_initialize_ppcobsd_nat): Construct and add target vector.
* config/powerpc/obsd.mh (NATDEPFILES): Remove infptrace.o and
inftarg.o.  Add inf-ptrace.o.
(NAT_FILE): Remove.
* Makefile.in (ppcobsd-nat.o): Update dependencies.