minor #30839 Skip Glob brace test when GLOB_BRACE is unavailable (wouterj)

This PR was merged into the 3.4 branch.

Discussion
----------

Skip Glob brace test when GLOB_BRACE is unavailable

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

From [PHP.net](https://www.php.net/glob):

 > Note: The GLOB_BRACE flag is not available on some non GNU systems, like Solaris.

This means running the testsuite in e.g. a php-alpine container fails atm. This test should be skipped in these environments.

Commits
-------

ce38fe3e58 Skip Glob brace test when GLOB_BRACE is unavailable

src/Symfony/Component/Finder/Tests/FinderTest.php

@@ -339,6 +339,10 @@ class FinderTest extends Iterator\RealIteratorTestCase
 
     public function testInWithGlobBrace()
     {
+        if (!\defined('GLOB_BRACE')) {
+            $this->markTestSkipped('Glob brace is not supported on this system.');
+        }
+
         $finder = $this->buildFinder();
         $finder->in([__DIR__.'/Fixtures/{A,copy/A}/B/C'])->getIterator();