minor #22761 [Intl] Fix intl tests for PHP < 5.5.10 (ogizanagi)

This PR was merged into the 2.7 branch.

Discussion
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[Intl] Fix intl tests for PHP < 5.5.10

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

Should fix tests in upper branches (see symfony/symfony#22760).

Commits
-------

fab0629206 [Intl] Fix intl tests for PHP < 5.5.10

Author: fabpot

Tests/DateFormatter/AbstractIntlDateFormatterTest.php

@@ -342,7 +342,7 @@ public function formatWithTimezoneProvider()
 
     /**
      * @dataProvider formatTimezoneProvider
-     * @requires PHP 5.5
+     * @requires PHP 5.5.10
      */
     public function testFormatTimezone($pattern, $timezone, $expected)
     {
@@ -459,15 +459,11 @@ public function testFormatWithConstructorTimezone()
         );
     }
 
+    /**
+     * @requires PHP 5.5.10
+     */
     public function testFormatWithDateTimeZoneGmt()
     {
-        if (PHP_VERSION_ID < 50500 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
-            $this->markTestSkipped('Only in PHP 5.5+ IntlDateFormatter allows to use DateTimeZone objects.');
-        }
-        if (PHP_VERSION_ID < 50510) {
-            $this->markTestSkipped('Before PHP 5.5.10 the GMT timezone used to be converted to UTC.');
-        }
-
         $formatter = $this->getDateFormatter('en', IntlDateFormatter::MEDIUM, IntlDateFormatter::SHORT, new \DateTimeZone('GMT'), IntlDateFormatter::GREGORIAN, 'zzz');
 
         $this->assertEquals('GMT', $formatter->format(0));