payloads/external: Rename Makefile.inc to Makefile

These makefiles are not included by anything, so they shouldn't be
named Makefile.inc.  Also, having them all be named 'Makefile' makes
some other consolidation work I'm doing much easier.

Change-Id: I1234539ba6a0a6f47d2eb0c21de3da3607c6b8de
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14130
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

payloads/external/Memtest86Plus/Makefile

@@ -0,0 +1,42 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2016 Google 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; version 2 of the License.
+##
+## 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.
+##
+
+project_name=Memtest86+
+project_dir=$(CURDIR)/memtest86plus
+project_git_repo=https://review.coreboot.org/memtest86plus
+
+all: build
+
+$(project_dir):
+	echo "    Cloning $(project_name) from Git"
+	git clone $(project_git_repo) $(project_dir)
+
+fetch: $(project_dir)
+	cd $(project_dir); \
+		test -e '.git' && \
+		git fetch && \
+		git checkout origin/master
+
+build: fetch
+	echo "    MAKE       $(project_name)"
+	$(MAKE) -C $(project_dir) all
+
+clean:
+	test -d $(project_dir) && $(MAKE) -C $(project_dir) clean || exit 0
+
+distclean:
+	rm -rf $(project_dir)
+
+.PHONY: all build fetch clean distclean