This function deletes a shared object. The share handle cannot be used anymore
when this function has been called.
RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred as <curl/curl.h> defines. See the libcurl-errors.3
man page for the full list with descriptions. If an error occurs, then the
share object will not be deleted.
