Multisite: Replace `is_super_admin()` with `update_core` for update permissions.

Fixes #39060. See #37616.

Built from https://develop.svn.wordpress.org/trunk@39540


git-svn-id: http://core.svn.wordpress.org/trunk@39480 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/menu.php

@@ -28,8 +28,9 @@ if ( is_multisite() ) {
 	$submenu[ 'index.php' ][5] = array( __('My Sites'), 'read', 'my-sites.php' );
 }
 
-if ( ! is_multisite() || is_super_admin() )
+if ( ! is_multisite() || current_user_can( 'update_core' ) ) {
 	$update_data = wp_get_update_data();
+}
 
 if ( ! is_multisite() ) {
 	if ( current_user_can( 'update_core' ) )

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39539';
+$wp_version = '4.8-alpha-39540';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.