Fix erl_prim_loader errors in handling of primary archive

The following errors have been corrected:

* If primary archive was named "xxx", then a file in the same
  directory named "xxxyyy" would be interpreted as a file named yyy
  inside the archive.

* erl_prim_loader did not correctly create and normalize absolute
  paths for primary archive and files inside it, so unless given with
  exact same path files inside the archive would not be found. E.g. if
  escript was started as /full/path/to/xxx then "./xxx/file" would not
  be found since erl_prim_loader would try to match /full/path/to/xxx
  with /full/path/to/./xxx. Same problem with ../.

* Depending on how the primary archive was built,
  erl_prim_loader:list_dir/1 would sometimes return an empty string
  inside the file list. This was a virtual element representing the
  top directory of the archive. This has been removed.

Thanks to Tuncer Ayaz and Shunichi Shinohara for reporting and
co-authoring corrections.

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