General: Remove Windows Live Writer manifest file.

The XML manifest was originally added in WordPress 2.3.1 to turn on tagging support in Windows Live Writer.

Given that the last major release of the software came out in 2012, and it was completely discontinued in January 2017, including this file in core no longer provides any benefit.

Follow-up to [6192], [49904].

Props joostdevalk, ayeshrajans, flixos90, jhabdas, frank-klein, wtranch, SergeyBiryukov.
Fixes #41404.
Built from https://develop.svn.wordpress.org/trunk@55620


git-svn-id: http://core.svn.wordpress.org/trunk@55132 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/general-template.php

@@ -3372,19 +3372,6 @@ function rsd_link() {
 	);
 }
 
-/**
- * Displays the link to the Windows Live Writer manifest file.
- *
- * @link https://msdn.microsoft.com/en-us/library/bb463265.aspx
- * @since 2.3.1
- */
-function wlwmanifest_link() {
-	printf(
-		'<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="%s" />' . "\n",
-		includes_url( 'wlwmanifest.xml' )
-	);
-}
-
 /**
  * Displays a referrer `strict-origin-when-cross-origin` meta tag.
  *