Privacy: use `wp_login_url()` for the link in the user confirmation email.

Props desrosj, usmankhalid.
Merges [43379] to the 4.9 branch.
Fixes #44353.
Built from https://develop.svn.wordpress.org/branches/4.9@43456


git-svn-id: http://core.svn.wordpress.org/branches/4.9@43283 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/user.php

@@ -3281,7 +3281,7 @@ function wp_send_user_request( $request_id ) {
 			'action'      => 'confirmaction',
 			'request_id'  => $request_id,
 			'confirm_key' => wp_generate_user_request_key( $request_id ),
-		), site_url( 'wp-login.php' ) ),
+		), wp_login_url() ),
 		'sitename'    => is_multisite() ? get_site_option( 'site_name' ) : get_option( 'blogname' ),
 		'siteurl'     => network_home_url(),
 	);

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.8-alpha-43455';
+$wp_version = '4.9.8-alpha-43456';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.