Function safe_app::ffi::nfs::dir_update_file

#[no_mangle]
pub unsafe extern "C" fn dir_update_file(
    app: *const App, 
    parent_info: *const MDataInfo, 
    file_name: *const c_char, 
    file: *const File, 
    version: u64, 
    user_data: *mut c_void, 
    o_cb: extern "C" fn(user_data: *mut c_void, result: *const FfiResult, new_version: u64)
)

Replace the file in the parent directory.

If version is GET_NEXT_VERSION, the correct version is obtained automatically.