Description:
------------
Hello,
after upgrading some of our environments to PHP 7.4 we've noticed that POSTing a CurlFile via CURLOPT_POSTFIELDS seems to cause a timeout. The test script works fine in PHP 7.3 but times out in 7.4. 

Test script:
---------------
<?php
$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => "http://localhost/testpost.php",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_SSL_VERIFYHOST => 0,
  CURLOPT_SSL_VERIFYPEER => 0,
  CURLOPT_TIMEOUT => 25,
  CURLOPT_FOLLOWLOCATION => false,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => array('file'=> new CURLFILE('C:/test.txt')),
));
$response = curl_exec($curl);
var_dump($response);
curl_close($curl);
?>

TestPost.php
<?php 
var_dump($_POST);
var_dump($_FILES);
?>


Expected result:
----------------
A reply from the TestPost.php script containing information about the file I sent earlier.

Actual result:
--------------
PHP/Curl times out.