Flatten GNU Make directory structure

third_party/make/exitfail.c

@@ -0,0 +1,19 @@
+/* clang-format off */
+/* Failure exit status
+
+   Copyright (C) 2002-2003, 2005-2007, 2009-2020 Free Software Foundation, Inc.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+int volatile exit_failure = 1; /*TODO: this should be EXIT_FAILURE; */