Add missing file expected with rev 279781

From-SVN: r279785

gcc/config/vxworks/vxworks-predef.h

+/* This file is part of GCC.
+
+GCC 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 3, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef _VXWORKS_PREDEF_H
+#define _VXWORKS_PREDEF_H  1
+
+#define __STDC_IEC_559__		1
+#define __STDC_IEC_559_COMPLEX__	1
+
+/* Define the value of the following macro to match the value
+   that the OS actually defines it as.  */
+#define __STDC_ISO_10646__		200009L
+
+#endif