MySQL stricton again ... remove the version condition

Ref: #4349
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index 2573e3c..3a450ec 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -153,7 +153,7 @@
 			{
 				$this->simple_query('SET SESSION sql_mode = CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")');
 			}
-			elseif (version_compare($this->version(), '5.7', '>='))
+			else
 			{
 				$this->simple_query(
 					'SET SESSION sql_mode =
diff --git a/system/database/drivers/mysqli/mysqli_driver.php b/system/database/drivers/mysqli/mysqli_driver.php
index 397368b..323a67f 100644
--- a/system/database/drivers/mysqli/mysqli_driver.php
+++ b/system/database/drivers/mysqli/mysqli_driver.php
@@ -143,7 +143,7 @@
 			{
 				$this->_mysqli->options(MYSQLI_INIT_COMMAND, 'SET SESSION sql_mode = CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")');
 			}
-			elseif (version_compare($this->version(), '5.7', '>='))
+			else
 			{
 				$this->_mysqli->options(MYSQLI_INIT_COMMAND,
 					'SET SESSION sql_mode =
diff --git a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
index 0886216..c230651 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
@@ -139,7 +139,7 @@
 			{
 				$sql = 'CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")';
 			}
-			elseif (version_compare($this->version(), '5.7', '>='))
+			else
 			{
 				$sql = 'REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
                                         @@sql_mode,