#8 Configure fails on i686 machines

[Hugh Kennedy]

I had a problem installing this on my PIII Linux system
which appears as type i686-unknown-linux. On
examining config/config.sub, i noticed that only lower
end systems were recognised in the shell script.

After changing the i[345]86 instances to i[3456]86, this
worked fine. As this is a trivial edit, I didn't bother to
attach the ammended file.