DB Repair: Only allow non-falsey values of `WP_ALLOW_REPAIR` to access the DB repair functionality.

This allows defining the constant as `false` to prevent access (rather than requiring the constant to be removed entirely).

Props tiagohillebrandt, munklefish.
See #11717.
Fixes #42622.

Built from https://develop.svn.wordpress.org/trunk@42205


git-svn-id: http://core.svn.wordpress.org/trunk@42034 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/maint/repair.php

@@ -27,7 +27,7 @@ header( 'Content-Type: text/html; charset=utf-8' );
 
 <?php
 
-if ( ! defined( 'WP_ALLOW_REPAIR' ) ) {
+if ( ! defined( 'WP_ALLOW_REPAIR' ) || ! WP_ALLOW_REPAIR ) {
 
 	echo '<h1 class="screen-reader-text">' . __( 'Allow automatic database repair' ) . '</h1>';
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42203';
+$wp_version = '5.0-alpha-42205';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.