databases/mysql-shell: Fix build of the bundled MySQL 9.7.1 sources
Add two includes that no longer come in transitively: <type_traits>
in libs/mysql/gtid/tag_plain.h and <cstdlib> in router/src/harness/
src/stdx/filesystem.cc.
Reported by: pkg-fallout
Sponsored by: Netzkommune GmbH