* amd64fbsd-nat.c: Don't include <sys/procfs.h> and "gregset.h".

* amd64fbsd-nat.c: Don't include <sys/procfs.h> and "gregset.h".
(gregset_t, fpregset_t): Remove typedefs.
(REG_OFFSET): Rename argument.
(amd64bsd_r_reg_offset): Rename from reg_offset.
(supply_gregset, fill_gregset, supply_fpregset, fill_fpregset):
Remove functions.
(_initialize_amd64fbsd_nat): Use amd64fbsd64_r_reg_offset instead
of reg_offset.
* Makefile.in (amd64fbsd-nat.o): Update dependencies.