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WizzardSK fd1c0686f8 libretro: actually initialise the frontend VFS (#111 )

Closes #110. The core asked for VFS interface version 1, but
filestream_vfs_init() ignores anything below FILESTREAM_REQUIRED_VFS_VERSION
(2) and returns without storing a single callback, so the whole engine - which
already opens everything through rfopen()/filestream_open() - silently stayed
on plain stdio. Android SAF URIs and smb:// paths never reached the frontend.

It now asks for PATH_REQUIRED_VFS_VERSION (3) and initialises both the file
streams and the path helpers, because the engine checks its data files with
path_is_valid() before opening them and that check has to go through the same
VFS. A frontend that only offers v2 still gets the old behaviour (file streams
only) via a second request.

Tested with a harness that hands the core a VFS whose paths are not real file
paths (the way SAF URIs behave, "saf://..."): before the change
retro_load_game() fails, after it Doukutsu.exe, every data/ file, settings.dat
and the profiles are opened through the VFS callbacks and the game runs, with
no attempt to touch a path outside the VFS. Also verified unchanged on the
desktop - RetroArch 1.22.2 reports "Core requested version >= V3, providing V3"
and Cave Story boots and runs at 60fps.

2026-08-22 23:01:55 +02:00