axis: Don't directly use trp->result

This has been deprecated in Tcl for a very long time, and will
reportedly become a build error in Tcl 8.6. (sfbug#332)
emcsh: don't directly write to interp->result

This has been defined as not working for quite a long time.  It looks
like this routine is probably unused, but fix it anyway.  (sfbugs#332)