Re: MariaDB + mysql-libs Conflict
other than what Rupert suggests, the only thing I could suggest really isn't recommended.
That is to use rpm -i --nodeps to install Pure-ftpd to get it installed without checking dependencies.
This is not recommended because if you use it, you have the potential to completely trash your system. I would make sure any other dependencies for Pure-ftpd are installed before doing it, and be very careful what conflicts do exist, making certain they aren't going to cause you problems if you force it to install anyway.
Once again, it's not a recommended way to install things, so be forewarned if you do decide to do it. It can break your system.