include/elf:

include/elf:
* common.h: Update copyright years.
(NT_NETBSDCORE_PROCINFO): Define.
(NT_NETBSDCORE_FIRSTMACH): Define.

bfd:
* elf.c: Update copyright years.
(elfcore_grok_netbsd_note): Use NT_NETBSDCORE_PROCINFO
and NT_NETBSDCORE_FIRSTMACH.  Improve a comment.

bintuils:
* readelf.c (get_netbsd_elfcore_note_type): Use
NT_NETBSDCORE_PROCINFO and NT_NETBSDCORE_FIRSTMACH.