Update license and remove unused files.

mentos/src/system/errno.c

@@ -1,6 +1,6 @@
 /// @file errno.c
 /// @brief
-/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
 /// See LICENSE.md for details.
 
 #include "sys/errno.h"

mentos/src/system/panic.c

@@ -1,6 +1,6 @@
 /// @file panic.c
 /// @brief Functions used to manage kernel panic.
-/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
 /// See LICENSE.md for details.
 
 #include "system/panic.h"

mentos/src/system/printk.c

@@ -1,6 +1,6 @@
 /// @file printk.c
 /// @brief Functions for managing the kernel messages.
-/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
 /// See LICENSE.md for details.
 
 #include "system/printk.h"

mentos/src/system/signal.c

@@ -1,6 +1,6 @@
 /// @file signal.c
 /// @brief Signals definition.
-/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
 /// See LICENSE.md for details.
 
 // Include the kernel log levels.

mentos/src/system/syscall.c

@@ -1,6 +1,6 @@
 /// @file syscall.c
 /// @brief System Call management functions.
-/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
 /// See LICENSE.md for details.
 
 // Include the kernel log levels.