Don't run if installing, fixes $4772

git-svn-id: http://svn.automattic.com/wordpress/trunk@5900 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/update.php

@@ -3,6 +3,9 @@
 // A simple set of functions to check our version 1.0 update service
 
 function wp_version_check() {
+	if ( strpos($_SERVER['PHP_SELF'], 'install.php') !== false || defined('WP_INSTALLING') )
+		return;
+
 	global $wp_version;
 	$php_version = phpversion();