* alphabsd-tdep.h: Tweak comments.

* alphabsd-tdep.h: Tweak comments.
(SIZOEF_STRUCT_REG, SIZEOF_STRUCT_FPREG): Remove.
* alphanbsd-tdep.c: Reorder includes.  Include "regset.h".
(ALPHANBSD_SIZEOF_GREGS, ALPHANBSD_SIZEOF_FPREGS): New defines.
(alphanbsd_supply_fpregset, alphanbsd_supply_gregset)
(alphanbsd_aout_supply_gregset): New functions.
(alphanbsd_gregset, alphanbsd_fpregset, alphanbsd_aout_gregset):
New variables.
(alphanbsd_regset_from_core_section)
(alphanbsd_aout_regset_from_core_section): New functions.
(fetch_core_registers, fetch_elfcore_registers): Remove functions.
(alphanbsd_core_fns, alphanbsd_elf_fns): Remove variables.
(alphanbsd_init_abi): Set regset_from_core_section.
(alphanbsd_aout_init_abi, alphanbsd_core_osabi_sniffer): New
functions.
(_initialize_alphanbsd_tdep): Register NetBSD core file sniffer.
Use alphanbsd_aout_init_abi whre appropriate.  Don't call
deprecated_add_core_fns.
* Makefile.in (alphanbsd-tdep.o): Update dependencies.