Taxonomy: Disallow overriding the `name` property when registering a taxonomy.

Props wpfo for initial patch, swissspidy.
Merges [40049] to the 4.7 branch.
Fixes #39308.

Built from https://develop.svn.wordpress.org/branches/4.7@40083


git-svn-id: http://core.svn.wordpress.org/branches/4.7@40020 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-taxonomy.php

@@ -333,6 +333,8 @@ final class WP_Taxonomy {
 			}
 		}
 
+		$args['name'] = $this->name;
+
 		foreach ( $args as $property_name => $property_value ) {
 			$this->$property_name = $property_value;
 		}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7.3-alpha-40081';
+$wp_version = '4.7.3-alpha-40083';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.