vfs_real: keep only the path in a real file

A real file kept its path three times: the path, its parent's path, and
the path split into components, which only gave the file's name. A loose
RomFS keeps one real file alive per file while the game runs: title 1's
206k files took 160 MB, now 48 MB. The name and the parent path are
derived from the path when asked, so a directory no longer passes its
own path to the files it opens.

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