Fixes 9ns fd set cloning

With the fix to dup, which moved the 9ns FD into the fdset, we weren't
copying the 9ns FDs over when cloning (during fork).
Busybox doesn't use internal echo

The builtin echo breaks up its write in a way that messes with 9ns
control files.

Copy out the bb config and rebuild busybox.  Be sure to set up a symlink
for echo.
Removes myecho

Now that busybox's echo is good enough.
Fixes ipconfig typo