v.21.12Build/Testing/Packaging Improvements
Use Custom CMakeLists for Various Libraries in Build System Cleanup
Use our own CMakeLists forzlib-ng,cassandra,mariadb-connector-candxz,re2,sentry,gsasl,arrow,protobuf. This is needed for #20151. Part of #9226. A small step towards removal of annoying trash from the build system. #30599 (alexey-milovidov).