CSS: Stop using wp-admin.min.css and instead queue the individual stylesheets up through load-styles.php.

We still generate the `wp-admin.*` files for compabitility purposes, however they only include the `@import()` lines.

Fixes #35229

Built from https://develop.svn.wordpress.org/trunk@36341


git-svn-id: http://core.svn.wordpress.org/trunk@36308 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-login.php

@@ -68,7 +68,7 @@ function login_header( $title = 'Log In', $message = '', $wp_error = '' ) {
 	<title><?php bloginfo('name'); ?> &rsaquo; <?php echo $title; ?></title>
 	<?php
 
-	wp_admin_css( 'login', true );
+	wp_enqueue_style( 'login' );
 
 	/*
 	 * Remove all stored post data on logging out.
@@ -87,6 +87,7 @@ function login_header( $title = 'Log In', $message = '', $wp_error = '' ) {
 	 * @since 3.1.0
 	 */
 	do_action( 'login_enqueue_scripts' );
+
 	/**
 	 * Fires in the login page header after scripts are enqueued.
 	 *