libc mkdir() is denied on the FUSE-backed emulated storage Android hands out for
a user-chosen data folder, while java.io.File.mkdirs() on the same path succeeds.
FileSystem::CreateDirectoryPath went straight to mkdir() and returned failure, so
every folder-memory-card save-data creation failed: "Format failed", and a crash
on first save in Soul Calibur 2 / Ratchet & Clank / GT4. Reproduced only with a
custom data folder, never with internal app storage.
A Java bridge for exactly this existed (NativeApp.createDirectoryPath plus the
FileSystem::CreateDirectoryViaJava JNI) but nothing called it after the monorepo
migration - the linker was dropping it as dead code. Wire it in as a fallback on
EPERM/EACCES, in both the flat and per-segment recursive paths.
Also adds folder-card import, which had no working route at all: a folder card is
a directory plus a _pcsx2_superblock marker, but the picker was OpenDocument()
(files only), so people zipped them and the importer appended ".ps2" to the
archive and copied it verbatim - producing a card the core read as unformatted.
Directories can now be imported directly, zips are unpacked, and both validate
the superblock instead of silently producing a broken card.
jpolo1224
265ddb7657