Rename run-test.php to run-tests.php in the test packs

In the php-src repository, the test runner is named run-tests.php, but
when it is copied to the tests packs, it is renamed to run-test.php.
This renaming does not make sense, and is actually somewhat confusing.
Although changing the name back to run-tests.php constitutes a BC
break, we think the benefit of having a single name outweights the
disadvantages in the long run.

Author: cmb69

UPGRADING

@@ -413,6 +413,10 @@ PHP 8.0 UPGRADE NOTES
 12. Windows Support
 ========================================
 
+- php-test-pack:
+  . The test runner has been renamed from run-test.php to run-tests.php, to
+    match its name in php-src.
+
 ========================================
 13. Other Changes
 ========================================

win32/build/mkdist.php

@@ -496,7 +496,7 @@ function make_phar_dot_phar($dist_dir)
 foreach ($dirs as $dir) {
 	copy_test_dir($dir, $test_dir);
 }
-copy('run-tests.php', $test_dir . '/run-test.php');
+copy('run-tests.php', $test_dir . '/run-tests.php');
 
 /* change this next line to true to use good-old
  * hand-assembled go-pear-bundle from the snapshot template */