rem: iconv_stream *iconv_ostream_fopen(iconv_t cd, FILE *handle)
add: iconv_stream *iconv_ostream_fopen(apr_iconv_t cd, FILE *handle)
context: iconv_stream *iconv_ostream_fopen(iconv_t cd, FILE *handle){    return iconv_stream_open(cd, handle, fwrite_wrapper);}