rtems: Remove deprecated <rtems/system.h>

Close #3980.

cpukit/headers.am

@@ -166,7 +166,6 @@ include_rtems_HEADERS += include/rtems/status-checks.h
 include_rtems_HEADERS += include/rtems/stdio-redirect.h
 include_rtems_HEADERS += include/rtems/stringto.h
 include_rtems_HEADERS += include/rtems/sysinit.h
-include_rtems_HEADERS += include/rtems/system.h
 include_rtems_HEADERS += include/rtems/telnetd.h
 include_rtems_HEADERS += include/rtems/termios_printk.h
 include_rtems_HEADERS += include/rtems/termios_printk_cnf.h

cpukit/include/rtems.h

@@ -26,7 +26,6 @@
  */
 /** @{ */
 
-#include <rtems/system.h>
 #include <rtems/rtems/status.h>
 #include <rtems/rtems/types.h>
 

cpukit/include/rtems/system.h

@@ -1,46 +0,0 @@
-/**
- * @file
- *
- * @brief Information Included in Every Function in the Executive
- *
- * This include file contains information that is included in every
- * function in the executive.  This must be the first include file
- * included in all internal RTEMS files.
- */
-
-/*
- *  COPYRIGHT (c) 1989-2007.
- *  On-Line Applications Research Corporation (OAR).
- *
- *  The license and distribution terms for this file may be
- *  found in the file LICENSE in this distribution or at
- *  http://www.rtems.org/license/LICENSE.
- */
-
-#ifndef _RTEMS_SYSTEM_H
-#define _RTEMS_SYSTEM_H
-
-#include <rtems/score/cpu.h>
-
-#ifndef _RTEMS_H
-#warning "This header file is deprecated and will be removed in RTEMS 6"
-#endif
-
-/**
- *  @defgroup RTEMSScoreSystem System Information
- *
- *  @ingroup RTEMSScore
- */
-/**@{*/
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-/**@}*/
-#endif
-/* end of include file */