fix bug wrt to CURLOPT_POSTFIELDS where if you passed it code like:

$fields = array('foo' => 'bar');
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
curl_exec($ch);
as opposed to :

curl_setopt($ch, CURLOPT_POSTFIELDS, array('foo' => 'bar'));

you'll get a segv or no results, depending on the mood and cycle of the
moon.

ext/curl/interface.c

@@ -1084,7 +1084,7 @@ PHP_FUNCTION(curl_setopt)
 						error = curl_formadd(&first, &last, 
 											 CURLFORM_COPYNAME, string_key,
 											 CURLFORM_NAMELENGTH, string_key_len - 1,
-											 (ZVAL_REFCOUNT(*zvalue) > 1 ? CURLFORM_PTRCONTENTS : CURLFORM_COPYCONTENTS), postval, 
+											 CURLFORM_COPYCONTENTS, postval, 
 											 CURLFORM_CONTENTSLENGTH, Z_STRLEN_PP(current),
 											 CURLFORM_END);
 					}