Media: Add missing `mediaelement-migrate.js` script to get uglified.

Amends [41877].
See #42189, #39686.

Built from https://develop.svn.wordpress.org/trunk@41891


git-svn-id: http://core.svn.wordpress.org/trunk@41725 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/mediaelement/mediaelement-migrate.min.js

@@ -0,0 +1 @@
+!function(a,b){void 0===mejs.plugins&&(mejs.plugins={},mejs.plugins.silverlight=[],mejs.plugins.silverlight.push({types:[]})),mejs.HtmlMediaElementShim=mejs.HtmlMediaElementShim||{getTypeFromFile:mejs.Utils.getTypeFromFile},void 0===mejs.MediaFeatures&&(mejs.MediaFeatures=mejs.Features),void 0===mejs.Utility&&(mejs.Utility=mejs.Utils);var c=MediaElementPlayer.prototype.init;MediaElementPlayer.prototype.init=function(){this.options.classPrefix="mejs-",this.$media=this.$node=b(this.node),c.call(this)};var d=MediaElementPlayer.prototype._meReady;MediaElementPlayer.prototype._meReady=function(){this.container=b(this.container),this.controls=b(this.controls),this.layers=b(this.layers),d.apply(this,arguments)},MediaElementPlayer.prototype.getElement=function(a){return void 0!==b&&a instanceof b?a[0]:a},MediaElementPlayer.prototype.buildfeatures=function(a,c,d,e){for(var f=["playpause","current","progress","duration","tracks","volume","fullscreen"],g=0,h=this.options.features.length;g<h;g++){var i=this.options.features[g];if(this["build"+i])try{f.indexOf(i)===-1?this["build"+i](a,b(c),b(d),e):this["build"+i](a,c,d,e)}catch(j){console.error("error building "+i,j)}}}}(window,jQuery);

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-beta2-41890';
+$wp_version = '4.9-beta2-41891';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.