libopenldap: Add missing Config.in hook

[Grommish]

Package has a consistent Config.in file, but it isn't added to all parts of the file.

libopenldap is unable to be built with --enable-debug because the Config.in is never attached to Package/libopenldap/Config

[LaneaLucy]

could this please be backported or patched or whatever to 23.05? thx