Fix `preg_match_all()` syntax in PCRE benchmark test util.

In versions of PHP earlier than 5.4, the `$matches` parameter was required.
Excluding it here meant that PCRE benchmarking tests were erroring on older
versions of PHP without cleaning up the PCRE ini settings, causing various
problems on later tests.

Props miqrogroove, dd32, boonebgorges.

And to the cosmic forces that cause bugs like this. The best part of waking up
is diagnosing leakage between automated tests.

See #34121.
Built from https://develop.svn.wordpress.org/trunk@34772


git-svn-id: http://core.svn.wordpress.org/trunk@34737 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34771';
+$wp_version = '4.4-alpha-34772';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.