[php_cs] disable fopen_flags

Author: nicolas-grekas

.php_cs.dist

@@ -11,6 +11,7 @@ return PhpCsFixer\Config::create()
         '@PHPUnit48Migration:risky' => true,
         'php_unit_no_expectation_annotation' => false, // part of `PHPUnitXYMigration:risky` ruleset, to be enabled when PHPUnit 4.x support will be dropped, as we don't want to rewrite exceptions handling twice
         'array_syntax' => array('syntax' => 'long'),
+        'fopen_flags' => false,
         'ordered_imports' => true,
         'protected_to_private' => false,
         // rule disabled due to https://bugs.php.net/bug.php?id=60573 bug;