Drop the now unused enum

Author: kamil-tekiela

ext/mysqlnd/mysqlnd_enum_n_def.h

@@ -252,16 +252,6 @@ typedef enum mysqlnd_client_option
 	MYSQLND_OPT_AUTH_PROTOCOL = 211
 } enum_mysqlnd_client_option;
 
-typedef enum mysqlnd_session_protocol_type
-{
-	MYSQL_PROTOCOL_DEFAULT = 0,
-	MYSQL_PROTOCOL_TCP,		/* all, supported */
-	MYSQL_PROTOCOL_SOCKET,	/* unix, supported */
-	MYSQL_PROTOCOL_PIPE,	/* win32, not-supported */
-	MYSQL_PROTOCOL_MEMORY,	/* win32, not-supported */
-	MYSQL_PROTOCOL_LAST
-} enum_mysqlnd_session_protocol_type;
-
 typedef enum mysqlnd_field_types
 {
 	MYSQL_TYPE_DECIMAL	= 0,