minor #23021 Using FQ name for PHP_VERSION_ID (fabpot)

This PR was merged into the 2.7 branch.

Discussion
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Using FQ name for PHP_VERSION_ID

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #22650, replaces #23000
| License       | MIT
| Doc PR        | n/a

Commits
-------

150a48b Using FQ name for PHP_VERSION_ID

Author: fabpot

Iterator/FilterIterator.php

@@ -29,7 +29,7 @@ abstract class FilterIterator extends \FilterIterator
      */
     public function rewind()
     {
-        if (PHP_VERSION_ID > 50607 || (PHP_VERSION_ID > 50523 && PHP_VERSION_ID < 50600)) {
+        if (\PHP_VERSION_ID > 50607 || (\PHP_VERSION_ID > 50523 && \PHP_VERSION_ID < 50600)) {
             parent::rewind();
 
             return;

Iterator/RecursiveDirectoryIterator.php

@@ -119,7 +119,7 @@ public function rewind()
         }
 
         // @see https://bugs.php.net/68557
-        if (PHP_VERSION_ID < 50523 || PHP_VERSION_ID >= 50600 && PHP_VERSION_ID < 50607) {
+        if (\PHP_VERSION_ID < 50523 || \PHP_VERSION_ID >= 50600 && \PHP_VERSION_ID < 50607) {
             parent::next();
         }