merged branch lyrixx/email-validator-php533 (PR #8712)

This PR was merged into the master branch.

Discussion
----------

 	[Validator] Removed unnecessary check as symfony requires php >= 5.3.3.

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

Commits
-------

cf31dfb [Validator] Removed unnecessary check as symfony require php >= 5.3.3.

src/Symfony/Component/Validator/Constraints/EmailValidator.php

@@ -41,11 +41,6 @@ class EmailValidator extends ConstraintValidator
         if ($valid) {
             $host = substr($value, strpos($value, '@') + 1);
 
-            if (version_compare(PHP_VERSION, '5.3.3', '<') && strpos($host, '.') === false) {
-                // Likely not a FQDN, bug in PHP FILTER_VALIDATE_EMAIL prior to PHP 5.3.3
-                $valid = false;
-            }
-
             // Check for host DNS resource records
             if ($valid && $constraint->checkMX) {
                 $valid = $this->checkMX($host);