gdb/ChangeLog: Update year range in copyright notice of all files.
Two modifications: 1. The addition of 2013 to the copyright year range for every file; 2. The use of a single year range, instead of potentially multiple year ranges, as approved by the FSF.
PR gdb/12953 * Makefile.in (HFILES_NO_SRCDIR): Add amd64bsd-nat.h. * amd64bsd-nat.c: Add support for debug registers (adapted from i386bsd-nat.c). [HAVE_PT_GETDBREGS] (amd64bsd_dr_get, amd64bsd_dr_set) (amd64bsd_dr_set_control, amd64bsd_dr_set_addr) (amd64bsd_dr_get_addr, amd64bsd_dr_get_status) (amd64bsd_dr_get_control): New functions. * amd64bsd-nat.h: New file (adapted from i386bsd-nat.h). * amd64fbsd-nat.c: Include "amd64bsd-nat.h", "i386-nat.h". [HAVE_PT_GETDBREGS] (_initialize_amd64fbsd_nat): Add hardware watchpoints initialization. * config/i386/fbsd64.mh (NATDEPFILES): Add i386-nat.o.
