REST API: Load missing required file for multisite users in WP_REST_Attachments_Controller::create_item().

Requires wp-admin/includes/image.php to make `wp_read_image_metadata()` function available. Fixes error introduced in [43589].

Props ocean90, soulseekah.
Fixes #43757.
Built from https://develop.svn.wordpress.org/trunk@43604


git-svn-id: http://core.svn.wordpress.org/trunk@43433 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -122,6 +122,9 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 		$type = $file['type'];
 		$file = $file['file'];
 
+		// Include image functions to get access to wp_read_image_metadata().
+		require_once ABSPATH . 'wp-admin/includes/image.php';
+
 		// use image exif/iptc data for title and caption defaults if possible
 		$image_meta = wp_read_image_metadata( $file );
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43603';
+$wp_version = '5.0-alpha-43604';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.