SilcBool silc_sftp_fs_memory_del_file(SilcSFTPFilesystem fs, void *dir,
                                          const char *filename);

    Removes a file indicated by the `filename' from the directory
    indicated by the `dir'. Returns TRUE if the removing was success. This
    is the only way to remove files in the filesystem.  The filesystem does
    not allow removing files with remote access using the filesystem
    access function sftp_remove.