Description:
------------
There is a way to compile cURL without cookies support (--disable-cookies).
When it is done so every call curl_setopt() with COOKIE-related option will silently return FALSE without emitting any warning to user.

When it is done this way, cURL library will return a CURLE_UNKNOWN_OPTION (line 2488 in cURL lib/url.c) status code when trying to set an unsupported option. There should be a warning in such cases. That will alert user not only in case of disabled cookies support, but in all simmilar cases (when cURL library is build without support for some feature).

Test script:
---------------
<?php
$ch = curl_init();
var_dump(curl_setopt($ch, CURLOPT_COOKIE, "QQQ=12345"));
curl_close($ch);
?>


Expected result:
----------------
bool(false)
Warning: option XXX is not supported by your cURL library
<EOF>

Actual result:
--------------
bool(false)
<EOF>