rem: iconv_stream *iconv_stream_open(iconv_t cd, void *handle,
add: iconv_stream *iconv_stream_open(apr_iconv_t cd, void *handle,
context: iconv_stream *iconv_stream_open(iconv_t cd, void *handle,                                iconv_stream_func method){    iconv_stream *res = malloc(sizeof(iconv_stream));    if (!res)        return NULL;    res->cd = cd;    res->chars = res->in_bytes = res->out_bytes = 0;    res->buffer = res->buf_ptr = NULL;    res->handle = handle;    res->method = method;    return res;}