backuptool: Don't rely on the order of the elements in the list

We should not test symlinks using -e or -f, otherwise the order in
which the files are backed up and restored matters.

Change-Id: I9b87972b27a63ef562c0c5f46f943eafd0a08ce1

prebuilt/common/bin/backuptool.functions

@@ -8,7 +8,7 @@ export S=/system
 export V=13.0
 
 backup_file() {
-  if [ -e "$1" ]; then
+  if [ -e "$1" -o -L "$1" ]; then
     local F=`basename "$1"`
     local D=`dirname "$1"`
     # dont backup any apps that have odex files, they are useless
@@ -24,7 +24,7 @@ backup_file() {
 restore_file() {
   local FILE=`basename "$1"`
   local DIR=`dirname "$1"`
-  if [ -e "$C/$DIR/$FILE" ]; then
+  if [ -e "$C/$DIR/$FILE" -o -L "$C/$DIR/$FILE" ]; then
     if [ ! -d "$DIR" ]; then
       mkdir -p "$DIR";
     fi