Revert 794571f, hoping this makes the tests pass on Windows again

Author: sebastianbergmann

src/Util/Log/JUnit.php

@@ -9,7 +9,6 @@
  */
 namespace PHPUnit\Util\Log;
 
-use const PHP_EOL;
 use function class_exists;
 use function get_class;
 use function method_exists;
@@ -386,13 +385,13 @@ private function doAddFault(Test $test, Throwable $t, string $type): void
         }
 
         if ($test instanceof SelfDescribing) {
-            $buffer = $test->toString() . PHP_EOL;
+            $buffer = $test->toString() . "\n";
         } else {
             $buffer = '';
         }
 
         $buffer .= trim(
-            TestFailure::exceptionToString($t) . PHP_EOL .
+            TestFailure::exceptionToString($t) . "\n" .
             Filter::getFilteredStacktrace($t)
         );