KAME team really need to revisit struct res_state_ext in
	/usr/include/resolv.h.  is it acceptable if I remove it once
	from the header?  Quite unfortunately, libc contains globally
	accessible symbol:
>>extern struct __res_state_ext _res_ext;
	but I believe noone except libc code ever touches this.  This was
	introduced in sometime June 1999.

	If it is unacceptable, I think we need to do some trick during
	BIND4 -> 8 switch...

itojun