Add file missed during recent rtems changes.

From-SVN: r31350

gcc/config/rtems.h

+/* Configuration common to all targets running RTEMS. 
+   Copyright (C) 2000 Free Software Foundation, Inc. 
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* The system headers under RTEMS are C++-aware.  */
+#define NO_IMPLICIT_EXTERN_C

gcc/po/POTFILES.in

@@ -474,6 +474,7 @@ config/rs6000/xm-lynx.h
 config/rs6000/xm-mach.h
 config/rs6000/xm-rs6000.h
 config/rs6000/xm-sysv4.h
+config/rtems.h
 config/sh/elf.h
 config/sh/rtems.h
 config/sh/sh.c