* contrib/hbcurl/hbcurl.ch
+ added HB_CURLOPT_ER_BUFF_SETUP
curl_easy_setopt( curl, HB_CURLOPT_ER_BUFF_SETUP ) <- Initialize ERRORBUFFER
* contrib/hbcurl/core.c
+ added PRG functions:
read error from ERRORBUFFER
see https://curl.se/libcurl/c/CURLOPT_ERRORBUFFER.html
curl_easy_er_buff_get( curl ) -> cErrorBuffer