vfs: add retro_vfs_stat64_t #2399

Job	Run time
msys2-build-test (CLANG64, windows-latest)	8m 16s
msys2-build-test (MINGW64, windows-latest)	9m 53s
msys2-build-test (UCRT64, windows-latest)	9m 14s
msys2-build-test (CLANGARM64, windows-11-arm)	11m 16s
	38m 39s

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