Make the `'register_post_type_args'` filter introduced in [34242] available for built-in post types too.

Props MikeSchinkel.
Fixes #17447.
Built from https://develop.svn.wordpress.org/trunk@34451


git-svn-id: http://core.svn.wordpress.org/trunk@34415 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-functions.php

@@ -993,19 +993,15 @@ function register_post_type( $post_type, $args = array() ) {
 	// Sanitize post type name
 	$post_type = sanitize_key( $post_type );
 
-	if ( empty( $args['_builtin'] ) ) {
 	/**
 	 * Filter the arguments for registering a post type.
 	 *
-		 * Not available for built-in post types.
-		 *
 	 * @since 4.4.0
 	 *
 	 * @param array|string $args      Array or string of arguments for registering a post type.
 	 * @param string       $post_type Post type key.
 	 */
 	$args = apply_filters( 'register_post_type_args', $args, $post_type );
-	}
 
 	// Args prefixed with an underscore are reserved for internal use.
 	$defaults = array(

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34450';
+$wp_version = '4.4-alpha-34451';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.