Issue with aws.v3.phar

Another plugin loads aws.phar V3 before backwpup loads, when backwpup loads this error occurs.

[30-Dec-2019 21:51:37 UTC] PHP Fatal error: Cannot redeclare Aws\manifest() (previously declared in phar:///var/www/html/wp-content/plugins/c3-cloudfront-clear-cache/libs/aws.v3.phar/Aws/functions.php:322) in /var/www/html/wp-content/plugins/backwpup/vendor/aws/aws-sdk-php/src/functions.php on line 342

If you loaded the aws.v3.phar I could use the require_once directive, but that’s not how it’s being loaded. This is different than your older version 3.6.9 version which co-existed with the aws.v3.phar.