Linux: add a missing check for /usr/local/bin/gold/ld.

build/install-build-deps.sh

 #!/bin/bash -e
 
 # Copyright (c) 2011 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 267 matching lines @@
     else
       echo "Failed to restore /usr/bin/ld.orig as /usr/bin/ld"
     fi
     echo
   fi
   ;;
 esac
 
 # Check the gold version first.
 gold_up_to_date="1"
-case `/usr/local/gold/bin/ld --version` in
-*gold*2.2[1-9].*) ;;
-* )
-  gold_up_to_date="0"
-esac
+if [ -x "/usr/local/gold/bin/ld" ]
+then
+  case `/usr/local/gold/bin/ld --version` in
+  *gold*2.2[1-9].*) ;;
+  * )
+    gold_up_to_date="0"
+  esac
+fi
 
 # Then check and make sure ld.bfd exists.
 if [ "$gold_up_to_date" = "1" ] && [ ! -x "/usr/local/gold/bin/ld.bfd" ]
 then
   gold_up_to_date="0"
 fi
 
 if [ "$gold_up_to_date" = "0" ]
 then
   if test "$do_inst_gold" = ""
@@ skipping 198 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