use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/randutils.h b/libblkid/randutils.h
new file mode 100644
index 0000000..dec5e35
--- /dev/null
+++ b/libblkid/randutils.h
@@ -0,0 +1,12 @@
+#ifndef UTIL_LINUX_RANDUTILS
+#define UTIL_LINUX_RANDUTILS
+
+#ifdef HAVE_SRANDOM
+#define srand(x)	srandom(x)
+#define rand()		random()
+#endif
+
+extern int random_get_fd(void);
+extern void random_get_bytes(void *buf, size_t nbytes);
+
+#endif