dev-db/mysql: update ebuild draft

dev-db/mysql: update ebuild draft

- Add USE=router to control building of MySQL router program

- Add GLEP 81 support

- Use USE=ssl logic from dev-db/mysql-connector-c (=use bundled
  WolfSSL when no system SSL is used)

- Don't install perror and zlib_decompress man pages (these are
  client tools, i.e. should be installed via dev-db/mysql-connector-c
  package)

- Use CMAKE_POSITION_INDEPENDENT_CODE=ON

- Provide own config files for MySQL v8.0 (mainly because of new
  default charset)

- Update LibreSSL patch

Package-Manager: Portage-2.3.69, Repoman-2.3.16
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>