minor #31132 [VarDumper][Ldap] relax some locally failing tests (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
----------

[VarDumper][Ldap] relax some locally failing tests

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

88b27656cc [VarDumper][Ldap] relax some locally failing tests

src/Symfony/Component/Ldap/Tests/LdapTestCase.php

@@ -8,6 +8,14 @@ class LdapTestCase extends TestCase
 {
     protected function getLdapConfig()
     {
+        $h = @ldap_connect(getenv('LDAP_HOST'), getenv('LDAP_PORT'));
+
+        if (!$h || !@ldap_bind($h)) {
+            $this->markTestSkipped('No server is listening on LDAP_HOST:LDAP_PORT');
+        }
+
+        ldap_close($h);
+
         return [
             'host' => getenv('LDAP_HOST'),
             'port' => getenv('LDAP_PORT'),

src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php

@@ -37,7 +37,7 @@ ReflectionClass {
 %A]
   constants: array:3 [
     "IS_IMPLICIT_ABSTRACT" => 16
-    "IS_EXPLICIT_ABSTRACT" => 32
+    "IS_EXPLICIT_ABSTRACT" => %d
     "IS_FINAL" => %d
   ]
   properties: array:%d [