Coqdeplib.Flfindlib_deep_resolve ~file ~package tries to locate a .cmxs for a given package. It also searches for its dependencies.
Dependencies of coq-core.toplevel (i.e. coqc) are ignored.
file is used for error messages.
If a META file for package is found, it will try to use it to resolve the path to the .cmxs, and return a relative path to both. If not, it errors.
module Internal : sig ... end