Create the oilc symlink on installation.

install

@@ -34,9 +34,11 @@ main() {
  fi

  cd $PREFIX/bin
  if ! ln -s -f $exec_filename osh; then  # -f to overwrite
    die "Couldn't create osh symlink"
  fi
  for link in osh oilc; do
    if ! ln -s -f $exec_filename $link; then  # -f to overwrite
      die "Couldn't create $link symlink"
    fi
  done
}

main "$@"