Deprecate php4 style constructors

PHP7 is deprecating PHP4 style constructors, so we need to modify our code to have _construct methods that fire before the named PHP4 style constructors.  The PHP4 style constructors will call the PHP5 style constructor in case it is being called directly (usually via parent::METHOD).

This modifies external libraries to add PHP5 style constructors, but doesn't add a notice for when they are used.  In WordPress core code, PHP4 style constructors are being given a call to _deprecated_constructor. To the PHP4 style constructor I say "I know that I can't take no more | It ain't no lie | I wanna see you out that door | Baby, bye, bye, bye..."

Upstream: https://wiki.php.net/rfc/remove_php4_constructors

Props jdgrimes, netweb, jorbin
See #31982



git-svn-id: https://develop.svn.wordpress.org/trunk@32990 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/wp-profiler.php

@@ -21,12 +21,21 @@ class WPProfiler {
 	var $stack;
 	var $profile;
 
-	// constructor
-	function WPProfiler() {
+	/**
+	 * PHP5 constructor.
+	 */
+	function __construct() {
 		$this->stack = array();
 		$this->profile = array();
 	}
 
+	/**
+	 * PHP4 constructor.
+	 */
+	public function WPProfiler() {
+		self::__construct();
+	}
+
 	function start($name) {
 		$time = $this->microtime();