Missing new files from previous patch.

From-SVN: r171834

gcc/config/i386/mingw-pthread.h

+/* Defines that pthread library shall be enabled by default
+   for target.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+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.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#define TARGET_USE_PTHREAD_BY_DEFAULT 1

gcc/config/i386/t-mingw-pthread

+SHLIB_PTHREAD_CFLAG = -pthread
+SHLIB_PTHREAD_LDFLAG = -Wl,-lpthread