Tests: In `Tests_dbDelta::setUp()`, only force MyISAM database engine on MySQL versions older than 5.7.

Since MySQL 5.7, InnoDB engine supports `FULLTEXT` indexes, so forcing MyISAM is unnecessary.

Props xkon, joonasvanhatapio, SergeyBiryukov.
Fixes #49367.
Built from https://develop.svn.wordpress.org/trunk@47193


git-svn-id: http://core.svn.wordpress.org/trunk@46993 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-47192';
+$wp_version = '5.4-alpha-47193';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.