Upgrade to 1.45

https://github.com/librenms/librenms/releases/tag/1.45

• remove mcrypt from depends (no longer used)
• add pdo_mysql (long required but not included)
• remove lib from ROOT_DIRS
• mention sql-mode="" is no longer required
• Make ./validate.php work from a package

PR: 232658
Approved by: maintainer timeout (14 days)