Merge branch '5.0'

* 5.0:
  Tweak the code to avoid fabbot false positives
  Remove UPGRADE files for 4.x

Author: fabpot

Pipes/WindowsPipes.php

@@ -57,7 +57,7 @@ public function __construct($input, bool $haveReadSupport)
 
                     if (!$h = fopen($file.'.lock', 'w')) {
                         restore_error_handler();
-                        throw new RuntimeException(sprintf('A temporary file could not be opened to write the process output: %s.', $lastError));
+                        throw new RuntimeException('A temporary file could not be opened to write the process output: '.$lastError);
                     }
                     if (!flock($h, LOCK_EX | LOCK_NB)) {
                         continue 2;