Fix mysqli_get_client_stats test

MySQL removed RENAME DATABASE in 18300001c1dbbfddf9a0adcbaeea68956102bdd0
(Sept 2007, 5.1.23). As this briefest existance is very insignificant lets remove it.

It also breaks when testing against MariaDB.

As the alternate path in this test covers all supported MySQL and MariaDB
versions and a signifant portion of unsupported versions lets keep it simple.

Closes GH-6459.

Author: grooverdan

ext/mysqli/tests/mysqli_get_client_stats.phpt

@@ -666,7 +666,7 @@ mysqli.allow_local_infile=1
 	$info = $new_info;
 
 
-	// CREATE, ALTER, RENAME, DROP DATABASE
+	// CREATE, ALTER, DROP DATABASE
 	if (mysqli_query($link, "CREATE DATABASE mysqli_get_client_stats")) {
 
 		if (!is_array($new_info = mysqli_get_client_stats()) || empty($new_info))
@@ -685,25 +685,13 @@ mysqli.allow_local_infile=1
 		mysqli_get_client_stats_assert_eq('non_result_set_queries', $new_info, (string)($info['non_result_set_queries'] + 1), $test_counter, 'CREATE DATABASE');
 		$info = $new_info;
 
-		if (mysqli_get_server_version($link) > 51700) {
-			if (!mysqli_query($link, "RENAME DATABASE mysqli_get_client_stats TO mysqli_get_client_stats_"))
-				printf("[%03d] RENAME DATABASE failed, [%d] %s\n", ++$test_counter,
-					mysqli_errno($link), mysqli_error($link));
-
-			if (!is_array($new_info = mysqli_get_client_stats()) || empty($new_info))
-				printf("[%03d] Expecting array/any_non_empty, got %s/%s\n",
-					++$test_counter, gettype($new_info), $new_info);
-			mysqli_get_client_stats_assert_eq('non_result_set_queries', $new_info, (string)($info['non_result_set_queries'] + 1), $test_counter, 'CREATE DATABASE');
-			$info = $new_info;
-		} else {
-			if (!mysqli_query($link, "CREATE DATABASE mysqli_get_client_stats_"))
-				printf("[%03d] CREATE DATABASE failed, [%d] %s\n", ++$test_counter,
-					mysqli_errno($link), mysqli_error($link));
-			if (!is_array($new_info = mysqli_get_client_stats()) || empty($new_info))
-				printf("[%03d] Expecting array/any_non_empty, got %s/%s\n",
-					++$test_counter, gettype($new_info), $new_info);
-			$info = $new_info;
-		}
+		if (!mysqli_query($link, "CREATE DATABASE mysqli_get_client_stats_"))
+			printf("[%03d] CREATE DATABASE failed, [%d] %s\n", ++$test_counter,
+				mysqli_errno($link), mysqli_error($link));
+		if (!is_array($new_info = mysqli_get_client_stats()) || empty($new_info))
+			printf("[%03d] Expecting array/any_non_empty, got %s/%s\n",
+				++$test_counter, gettype($new_info), $new_info);
+		$info = $new_info;
 
 		if (!mysqli_query($link, "DROP DATABASE mysqli_get_client_stats_"))
 			printf("[%03d] DROP DATABASE failed, [%d] %s\n", ++$test_counter,