Moved to sys/conf/majors.

i assume also into the MI majors range?  i haven't looked at the
patch...
   
   And, moved from usr.sbin/fwctl/eui64.[ch] to lib/libc/net/eui64.c and
   sys/sys/eui64.h.  FreeBSD,s eui64.[ch] are there.
   
   Is it problem? 

is there a good reason to put this code in libc?  could it go into
libutil perhaps?  who are the users of it?


.mrg.