PINGBACKS: After [34442], switch to `is_singular()` to check attachments and pages as well.

See #20226.

Built from https://develop.svn.wordpress.org/trunk@34443


git-svn-id: http://core.svn.wordpress.org/trunk@34407 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp.php

@@ -597,7 +597,7 @@ class WP {
 		if ( is_admin() || is_robots() || $wp_query->posts ) {
 
 			// Only set X-Pingback for single posts.
-			if ( is_single() ) {
+			if ( is_singular() ) {
 				$p = get_queried_object();
 				if ( $p && pings_open( $p ) ) {
 					@header( 'X-Pingback: ' . get_bloginfo( 'pingback_url' ) );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34442';
+$wp_version = '4.4-alpha-34443';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.