1dca5af712
So far, when deleting a library (either explicitely, or through e.g. relocation), its dependencies would get a `nullptr` parent, and therefore become 'directly used' libraries. This commit adds a new util to rebuild the libraries hieararchy, and calls it when a Library ID is deleted. NOTE: While logic is somewhat similar to what liboverride resync does to sort the libraries by indirect levels (`lib_override_libraries_index_define`), there are some key differences here, notably the fact that if a library has a valid `parent` pointer, it is not replaced, even if a 'better' parent (less indirect library) could be found.
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