databases/mysql80-{client, server}: Update ports to 8.0.12
This update includes Oracle Critical Patch Advisory published on July 2018
More info:
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html#AppendixMSQL
Also:
Delete upstreamed hunks of patches.
Change local patches regarding upstream changes.

PR: 229861
Reported by: Markus Kohlmeyer <rootservice@gmail.com>
Sponsored by: The FreeBSD Foundation