Remove old build related scripts that are no longer needed.

src/scripts/extlinux.sh

-#!/bin/bash
-
-# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# Runs our own version of extlinux, which is in the third_party directory.
-# Our version is quieter and faster. extlinux will be compiled if it's not
-# already.
-
-set -e
-
-SCRIPTS_ROOT=`dirname "$0"`
-THIRD_PARTY="${SCRIPTS_ROOT}/../third_party"
-BUILD_ROOT=${BUILD_ROOT:-${SCRIPTS_ROOT}/../build}
-EXTLINUX_BIN="$BUILD_ROOT"/x86/obj/src/third_party/syslinux/syslinux-*/extlinux/extlinux
-
-echo bin is "$EXTLINUX_BIN"
-
-if [ ! -e $EXTLINUX_BIN ]
-then
-  # compile extlinux
-  (cd "$SCRIPTS_ROOT/../third_party/syslinux/files/" && make)
-  if [ ! -e $EXTLINUX_BIN ]
-  then
-    echo "Can't find or compile extlinux. Sorry."
-    exit 1
-  fi
-fi
-
-# we don't want ""s around $* b/c that will group all args into a single arg
-$EXTLINUX_BIN $*