Database: Add `ANSI` to the list of incompatible SQL modes.

Starting with MySQL 5.7.5, the `ANSI` mode implies `ONLY_FULL_GROUP_BY`, which is already listed in `wpdb` as incompatible per [27072].

When `ANSI` is enabled on MySQL 5.7.5+, `ONLY_FULL_GROUP_BY` remains enabled even after being "unset" by `wpdb::set_sql_mode()`.

To prevent this, the `ANSI` mode should also be listed as incompatible. It is not enabled on default MySQL installations.

Props jnylen0.
Fixes #48377.
Built from https://develop.svn.wordpress.org/trunk@47171


git-svn-id: http://core.svn.wordpress.org/trunk@46971 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-47170';
+$wp_version = '5.4-alpha-47171';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

wp-includes/wp-db.php

@@ -568,6 +568,7 @@ class wpdb {
 		'STRICT_TRANS_TABLES',
 		'STRICT_ALL_TABLES',
 		'TRADITIONAL',
+		'ANSI',
 	);
 
 	/**