databases/mysql80-{client, server}: Update to latest release 8.0.19

- New FPROFILE_GENERATE and FPROFILE_USE CMake options are available for experimenting with profile guided optimization (PGO) with GCC. See the cmake/fprofile.cmake in a MySQL source distribution for information about using them. These options have been tested with GCC 8 and 9, and with Clang.
- Enabling FPROFILE_USE also enables WITH_LTO (link time optimization).
- Innodb_system_rows_read, Innodb_system_rows_inserted, Innodb_system_rows_deleted status variables were added for counting row operations on InnoDB tables that belong to system-created schemas. The new status variables are similar to the existing Innodb_rows_read, Innodb_rows_inserted, Innodb_rows_deleted status variables, which count operations on InnoDB tables that belong to both user-created and system-created schemas.
- The new status variables are useful in replication environments where relay_log_info_repository and master_info_repository variables are set to TABLE, resulting in higher row operation counts on slaves due to operations performed on the slave_master_info, slave_replay_log_info, and slave_worker_info tables, which belong to the system-created mysql schema. For a valid comparison of master and slave row operation counts, operations on tables in system-created schemas can now be excluded using the count data provided by the new status variables.

More infos: https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-19.html

Submitted by:	fluffy
Approved by:	mmokhi (maintainer, implicit)
Sponsored by:	Netzkommune GmbH

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