use old nvmutil for now, in lbmk

i'm trying to make nvmutil work on openbsd. the new code
in lbutils is a bit buggy, likely somewhere in mkhtemp.
i'm still debugging it.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/nvmutil/Makefile

@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2022,2026 Leah Rowe <leah@libreboot.org>
+# Copyright (c) 2023 Riku Viitanen <riku.viitanen@protonmail.com>
+
+# Makefile for nvmutil, which is an application
+# that modifies Intel GbE NVM configurations.
+
+CC = cc
+HELLCC = clang
+
+CFLAGS =
+LDFLAGS =
+DESTDIR =
+PREFIX = /usr/local
+INSTALL = install
+
+.SUFFIXES: .c .o
+
+LDIR =
+
+PORTABLE = $(LDIR) $(CFLAGS)
+WARN = $(PORTABLE) -Wall -Wextra
+STRICT = $(WARN) -std=c90 -pedantic -Werror
+HELLFLAGS = $(STRICT) -Weverything
+
+PROG = nvmutil
+
+OBJS = \
+	obj/nvmutil.o \
+	obj/lib/state.o \
+	obj/lib/file.o \
+	obj/lib/string.o \
+	obj/lib/usage.o \
+	obj/lib/command.o \
+	obj/lib/num.o \
+	obj/lib/io.o \
+	obj/lib/checksum.o \
+	obj/lib/word.o
+
+# default mode
+CFLAGS_MODE = $(PORTABLE)
+CC_MODE = $(CC)
+
+all: $(PROG)
+
+$(PROG): $(OBJS)
+	$(CC_MODE) $(OBJS) -o $(PROG) $(LDFLAGS)
+
+# ensure obj directory exists
+$(OBJS): obj
+
+obj:
+	mkdir obj || true
+	mkdir obj/lib || true
+
+# main program object
+
+obj/nvmutil.o: nvmutil.c
+	$(CC_MODE) $(CFLAGS_MODE) -c nvmutil.c -o obj/nvmutil.o
+
+# library/helper objects
+
+obj/lib/state.o: lib/state.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/state.c -o obj/lib/state.o
+
+obj/lib/file.o: lib/file.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/file.c -o obj/lib/file.o
+
+obj/lib/string.o: lib/string.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/string.c -o obj/lib/string.o
+
+obj/lib/usage.o: lib/usage.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/usage.c -o obj/lib/usage.o
+
+obj/lib/command.o: lib/command.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/command.c -o obj/lib/command.o
+
+obj/lib/num.o: lib/num.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/num.c -o obj/lib/num.o
+
+obj/lib/io.o: lib/io.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/io.c -o obj/lib/io.o
+
+obj/lib/checksum.o: lib/checksum.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/checksum.c -o obj/lib/checksum.o
+
+obj/lib/word.o: lib/word.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/word.c -o obj/lib/word.o
+
+# install
+
+install: $(PROG)
+	$(INSTALL) -d $(DESTDIR)$(PREFIX)/bin
+	$(INSTALL) $(PROG) $(DESTDIR)$(PREFIX)/bin/$(PROG)
+	chmod 755 $(DESTDIR)$(PREFIX)/bin/$(PROG)
+
+uninstall:
+	rm -f $(DESTDIR)$(PREFIX)/bin/$(PROG)
+
+clean:
+	rm -f $(PROG) $(OBJS)
+
+distclean: clean
+
+# mode targets (portable replacement for ifeq)
+
+warn:
+	$(MAKE) CFLAGS_MODE="$(WARN)"
+
+strict:
+	$(MAKE) CFLAGS_MODE="$(STRICT)"
+
+hell:
+	$(MAKE) CFLAGS_MODE="$(HELLFLAGS)" CC_MODE="$(HELLCC)"