Revert "Fixed visibility declarations on dbforge and utility classes"

This reverts commit 78a2de4e049f478ec1efd92d639aaf11be933335.
diff --git a/system/database/drivers/odbc/odbc_forge.php b/system/database/drivers/odbc/odbc_forge.php
index c5b062e..121c096 100644
--- a/system/database/drivers/odbc/odbc_forge.php
+++ b/system/database/drivers/odbc/odbc_forge.php
@@ -42,7 +42,7 @@
 	 * @param	string	the database name
 	 * @return	bool
 	 */
-	public function _create_database()
+	protected function _create_database()
 	{
 		// ODBC has no "create database" command since it's
 		// designed to connect to an existing database
@@ -61,7 +61,7 @@
 	 * @param	string	the database name
 	 * @return	bool
 	 */
-	public function _drop_database($name)
+	protected function _drop_database($name)
 	{
 		// ODBC has no "drop database" command since it's
 		// designed to connect to an existing database
@@ -84,7 +84,7 @@
 	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
 	 * @return	bool
 	 */
-	public function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
+	protected function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
 	{
 		$sql = 'CREATE TABLE ';
 
@@ -185,7 +185,7 @@
 	 *
 	 * @return	bool
 	 */
-	public function _drop_table($table)
+	protected function _drop_table($table)
 	{
 		// Not a supported ODBC feature
 		if ($this->db->db_debug)
@@ -212,7 +212,7 @@
 	 * @param	string	the field after which we should add the new field
 	 * @return	object
 	 */
-	public function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
+	protected function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
 	{
 		$sql = 'ALTER TABLE '.$this->db->protect_identifiers($table).' '.$alter_type.' '.$this->db->protect_identifiers($column_name);
 
@@ -259,7 +259,7 @@
 	 * @param	string	the new table name
 	 * @return	string
 	 */
-	public function _rename_table($table_name, $new_table_name)
+	protected function _rename_table($table_name, $new_table_name)
 	{
 		return 'ALTER TABLE '.$this->db->protect_identifiers($table_name).' RENAME TO '.$this->db->protect_identifiers($new_table_name);
 	}
diff --git a/system/database/drivers/odbc/odbc_utility.php b/system/database/drivers/odbc/odbc_utility.php
index a07d3b6..d663da1 100644
--- a/system/database/drivers/odbc/odbc_utility.php
+++ b/system/database/drivers/odbc/odbc_utility.php
@@ -41,7 +41,7 @@
 	 *
 	 * @return	bool
 	 */
-	public function _list_databases()
+	protected function _list_databases()
 	{
 		// Not sure if ODBC lets you list all databases...
 		if ($this->db->db_debug)
@@ -61,7 +61,7 @@
 	 * @param	string	the table name
 	 * @return	object
 	 */
-	public function _optimize_table($table)
+	protected function _optimize_table($table)
 	{
 		// Not a supported ODBC feature
 		if ($this->db->db_debug)
@@ -81,7 +81,7 @@
 	 * @param	string	the table name
 	 * @return	object
 	 */
-	public function _repair_table($table)
+	protected function _repair_table($table)
 	{
 		// Not a supported ODBC feature
 		if ($this->db->db_debug)
@@ -99,7 +99,7 @@
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');