[Intl] Add polyfill for Locale::canonicalize()

Author: nicolas-grekas

Constraints/LocaleValidator.php

@@ -12,7 +12,6 @@
 namespace Symfony\Component\Validator\Constraints;
 
 use Symfony\Component\Intl\Intl;
-use Symfony\Component\Intl\Locale as IntlLocale;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
@@ -43,7 +42,7 @@ public function validate($value, Constraint $constraint)
 
         $value = (string) $value;
         if ($constraint->canonicalize) {
-            $value = IntlLocale::canonicalize($value);
+            $value = \Locale::canonicalize($value);
         }
         $localeBundle = Intl::getLocaleBundle();
         $locales = $localeBundle->getLocaleNames();

composer.json

@@ -24,7 +24,7 @@
         "symfony/http-foundation": "~4.1",
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/var-dumper": "~3.4|~4.0",
-        "symfony/intl": "~3.4|~4.0",
+        "symfony/intl": "~4.1",
         "symfony/yaml": "~3.4|~4.0",
         "symfony/config": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
@@ -39,6 +39,7 @@
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
         "symfony/dependency-injection": "<3.4",
         "symfony/http-kernel": "<3.4",
+        "symfony/intl": "<4.1",
         "symfony/yaml": "<3.4"
     },
     "suggest": {