Define `JSON_PRETTY_PRINT` so it can be used with `wp_json_encode()`

* `JSON_PRETTY_PRINT` was introduced in PHP 5.4
* Now you can use it with lower PHP versions, without a notice

fixes #30139
see #28786
Built from https://develop.svn.wordpress.org/trunk@30075


git-svn-id: http://core.svn.wordpress.org/trunk@30075 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/compat.php

@@ -122,4 +122,10 @@ function hash_equals( $a, $b ) {
 
 	return $result === 0;
 }
-endif;
+endif;
+
+// JSON_PRETTY_PRINT was introduced in PHP 5.4
+// Defined here to prevent a notice when using it with wp_json_encode()
+if ( ! defined( 'JSON_PRETTY_PRINT' ) ) {
+	define( 'JSON_PRETTY_PRINT', 128 );
+}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-alpha-30074';
+$wp_version = '4.1-alpha-30075';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.