Log Message:
(www/R-curl) Updated 4.3.2 to 5.0.0

5.0.0
 - New function multi_download() which supports concurrent downloads and resuming
   download for large files, while giving detailed progress information.
 - Windows: updated libcurl to 7.84.0 + nghttp2
 - Windows: default to CURLSSLOPT_NATIVE_CA when using openssl unless an ennvar
   with CURL_CA_BUNDLE is set.
 - Use the new optiontype API for type checking if available (libcurl 7.73.0)

4.3.3
 - Add support for setting ssl_ctx_function callbacks
 - Normalize curlopt_postfields to curlopt_copypostfields to transfer ownership
   of the input data to libcurl.
 - Fix strict-prototype errors