intelvbttool: Add Makefile

Add minimal Makefile based on cbmem’s Makefile.

The make target `junit.xml` is removed as this is handled differently
since commit de9adebb (Add junit.xml code to top Makefile.inc instead of
utils).

Also the `junit.xml` is removed in the make target `clean`.

Additionally, the make target `distclean` is added, as the current
junit.xml code in the top `Makefile.inc` requires that.

Change-Id: I164b1f7733505bca6248d0711d7ad71d635fa926
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/11876
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

util/intelvbttool/Makefile

@@ -0,0 +1,35 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.
+##
+## 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.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc.
+##
+
+PROGRAM = intelvbttool
+CC ?= gcc
+CFLAGS ?= -O2
+CFLAGS += -Wall -Werror
+
+all: $(PROGRAM)
+
+$(PROGRAM):
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(PROGRAM).c -o $(PROGRAM)
+
+clean:
+	rm -f $(PROGRAM) junit.xml
+
+distclean: clean
+
+.PHONY: all clean distclean