* m88kbsd-nat.c: Include "target.h" and "inf-ptrace.h".

* m88kbsd-nat.c: Include "target.h" and "inf-ptrace.h".
(m88kbsd_fetch_inferior_registers): Rename from
fetch_inferior_registers.  Make static.
(m88kbsd_store_inferior_registers): Rename from
store_inferior_registers.  Make static.
(_initialize_m88kbsd_nat): New prototype and function.
* config/m88k/obsd.mh (NATDEPFILES): Remove infptrace.o and
inftarg.o.  Add inf-child.o and inf-ptrace.o.
(NAT_FILE): Remove.
* Makefile.in (m88kbsd-nat.o): Update dependencies.