Fix for mcrypt_compat 2.0.4

[luigifab]

Description

This fix the following notice with PHP 8.0.27 and mcrypt_compat 2.0.4.
I'm not sure if it's good or not.

Notice: Only variables should be passed by reference  in lib/Varien/Crypt/Mcrypt.php on line 129

#0 lib/Varien/Crypt/Mcrypt.php(129): mageCoreErrorHandler()
#1 lib/Varien/Crypt/Mcrypt.php(48): Varien_Crypt_Mcrypt->_reset()
#2 [internal function]: Varien_Crypt_Mcrypt->destruct()
#3 {main}
  thrown in lib/Varien/Crypt/Mcrypt.php on line 129
  catched by Mage::printException() via mageCoreErrorHandler()

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

[fballiano]

merge and cherrypicked to v20