Fix unit test failures on MySQL 5.6 due to Custom Field table being created...

Fix unit test failures on MySQL 5.6 due to Custom Field table being created without Dynamic Row Format

CRM/Core/BAO/CustomField.php

@@ -1631,6 +1631,12 @@ SELECT $columnName
       ],
     ];
 
+    // If on MySQL 5.6 include ROW_FORMAT=DYNAMIC to fix unit tests
+    $databaseVersion = CRM_Utils_SQL::getDatabaseVersion();
+    if (version_compare($databaseVersion, '5.7', '<') && version_compare($databaseVersion, '5.6', '>=')) {
+      $table['attributes'] = $table['attributes'] . ' ROW_FORMAT=DYNAMIC';
+    }
+
     if (!$params['is_multiple']) {
       $table['indexes'] = [
         [