Fix "No such file or directory" error in sysroot_ld_path.sh if ld.so.conf include pattern doesn't match any file.

Sometimes ld.so.conf has pattern include like "include ld.so.conf.d/*.conf",
but there is no files that match pattern. In this case "for" loop in process_ld_so_conf
function fails with error "No such file or directory".
This patch uses "ls" to check that pattern matches at least one file.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/19044004

git-svn-id: http://src.chromium.org/svn/trunk/src/build@214230 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

linux/sysroot_ld_path.sh

@@ -46,14 +46,16 @@ process_ld_so_conf() {
       echo "$ENTRY" | grep -qs ^include
       if [ $? -eq 0 ]; then
         local included_files=$(echo "$ENTRY" | sed 's/^include //')
-        for inc_file in $included_files; do
-          echo $inc_file | grep -qs ^/
-          if [ $? -eq 0 ]; then
-            process_ld_so_conf "$root" "$root$inc_file"
-          else
-            process_ld_so_conf "$root" "$(pwd)/$inc_file"
-          fi
-        done
+        if ls $included_files >/dev/null 2>&1 ; then
+          for inc_file in $included_files; do
+            echo $inc_file | grep -qs ^/
+            if [ $? -eq 0 ]; then
+              process_ld_so_conf "$root" "$root$inc_file"
+            else
+              process_ld_so_conf "$root" "$(pwd)/$inc_file"
+            fi
+          done
+        fi
         continue
       fi