Do not overwrite ld.orig in install-build-deps.sh....

build/install-build-deps.sh

 #!/bin/bash -e
 
 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to install everything needed to build chromium (well, ideally, anyway)
 # See http://code.google.com/p/chromium/wiki/LinuxBuildInstructions
 # and http://code.google.com/p/chromium/wiki/LinuxBuild64Bit
 
@@ skipping 64 matching lines @@
   patch -p1 < ../binutils-fix.patch
   ./configure --prefix=/usr/local/gold --enable-gold
   make -j3
   if sudo make install
   then
     # Still need to figure out graceful way of pointing gyp to use
     # /usr/local/gold/bin/ld without requiring him to set environment
     # variables.  That will go into bootstrap-linux.sh when it's ready.
     echo "Installing gold as /usr/bin/ld."
     echo "To uninstall, do 'cd /usr/bin; sudo rm ld; sudo mv ld.orig ld'"
-    test -f /usr/bin/ld && sudo mv /usr/bin/ld /usr/bin/ld.orig
+    test -f /usr/bin/ld && test ! -f /usr/bin/ld.orig && \
+        sudo mv /usr/bin/ld /usr/bin/ld.orig
     sudo strip /usr/local/gold/bin/ld
     sudo ln -fs /usr/local/gold/bin/ld /usr/bin/ld.gold
     sudo ln -fs /usr/bin/ld.gold /usr/bin/ld
   else
     echo "make install failed, not installing gold"
   fi
 }
 
 if ! egrep -q 'Ubuntu (8\.04|8\.10|9\.04|9\.10)' /etc/issue; then
   echo "Only Ubuntu 8.04, 8.10, 9.04, and 9.10 are currently supported" >&2
@@ skipping 288 matching lines @@
              sed -e 's/[.]so[.][0-9].*/.so/' |
              sort -u); do
     [ "x${i##*/}" = "xld-linux.so" ] && continue
     [ -r "$i" ] && continue
     j="$(ls "$i."* | sed -e 's/.*[.]so[.]\([^.]*\)$/\1/;t;d' |
          sort -n | tail -n 1)"
     [ -r "$i.$j" ] || continue
     sudo ln -s "${i##*/}.$j" "$i"
   done
 fi