Add toplevel Makefile

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

Makefile

@@ -0,0 +1,31 @@
+CC ?= gcc
+CFLAGS += -Iinclude -Ilibsparse/include
+
+OBJ := \
+    allocate.o \
+	canned_fs_config.o \
+    contents.o \
+    crc16.o \
+    ext4fixup.o \
+    ext4_sb.o \
+    ext4_utils.o \
+    extent.o \
+    indirect.o \
+	make_ext4fs_main.o \
+    make_ext4fs.o \
+    sha1.o \
+    uuid.o \
+    wipe.o
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $^
+
+make_ext4fs: $(OBJ) libsparse/libsparse.a
+	$(CC) -o $@ $^ -lz
+
+libsparse/libsparse.a:
+	$(MAKE) -C libsparse/ libsparse.a
+
+clean:
+	$(MAKE) -C libsparse/ clean
+	rm -f $(OBJ) make_ext4fs