(ALL_TARGET_OBS): Add dicos-tdep.o.
	(ALLDEPFILES): Add amd64-dicos-tdep.c and dicos-tdep.c.
	* configure.tgt (i[34567]86-*-dicos*): Add dicos-tdep.o to
	gdb_target_obs.
	(x86_64-*-dicos*): Add dicos-tdep.o and amd64-dicos-tdep.o to
	gdb_target_obs.
	* dicos-tdep.h, dicos-tdep.c: New.
	* amd64-dicos-tdep.c: New.
	* i386-dicos-tdep.c: Don't include solib.h, solib-target.h or
	inferior.h.  Include dicos-tdep.h.
	(i386_dicos_init_abi): Call dicos_init_abi.
	(i386_dicos_bfd_has_symbol_p): Delete.
	(i386_dicos_osabi_sniffer): Use dicos_load_module_p.

	* NEWS: Mention x86-64 DICOS target support.