As best I can determine this was once used when doing a release, only now-a-days "i686-pc-linux-gnu" is used. This deletes the host/target "none".
baring comment, I'll commit in a few days,
Andrew
2004-02-18 Andrew Cagney <cagney@redhat.com>
* configure.tgt: Delete target "none-*-*".
* configure.host: Delete host "none-*-*".
* config/none/none.mh: Delete file.
* config/none/none.mt: Delete file.
* config/none/xm-none.h: Delete file.
* config/none/tm-none.h: Delete file.
* config/none/nm-none.h: Delete file.