Change Wakfu config to use it own Java version

use-wakfu-java.sh

echo "Starting..."

if [ ! -d jre/linux/x64/bin ]
then
  echo "no ./jre/linux/x64/bin folder found"
  exit
fi

chmod u+x jre/linux/x64/bin/*

if [ ! -f zaap-start.sh ]
then
  echo "no ./zaap-start.sh file found"
  exit
fi

mv zaap-start.sh zaap-start_bkp.sh
{
  # Try:
  sed -e 's@java ${java_xms} ${java_xmx} ${java_options}@./jre/linux/x64/bin/java ${java_xms} ${java_xmx} ${java_options}@g' zaap-start_bkp.sh > zaap-start.sh
} || {
  # On error:
  echo "Replacing string didn't work, restoring backup"
  cp zaap-start_bkp.sh zaap-start.sh
 }

echo "Finished."