minor symfony#24137 [Filesystem] skip tests if not applicable (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
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[Filesystem] skip tests if not applicable

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

Commits
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1605ce1 [Filesystem] skip tests if not applicable

Author: nicolas-grekas

src/Symfony/Component/Filesystem/Tests/FilesystemTest.php

@@ -1115,6 +1115,10 @@ public function testDumpFailsWithExceptionIfExecutablePermissionsForTheParentDir
         mkdir($target);
         chmod($this->workspace, 0666);
 
+        if (false !== @chdir($this->workspace)) {
+            $this->markTestSkipped('Test skipped as the used PHP version does not prevent entering directories without the required permissions.');
+        }
+
         $this->filesystem->dumpFile($file, 'baz');
     }