use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/at.h b/libblkid/at.h
new file mode 100644
index 0000000..63a80f0
--- /dev/null
+++ b/libblkid/at.h
@@ -0,0 +1,32 @@
+/*
+ * wrappers for "at" functions.
+ *
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#ifndef UTIL_LINUX_AT_H
+#define UTIL_LINUX_AT_H
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "c.h"
+
+extern int fstat_at(int dir, const char *dirname,
+ const char *filename, struct stat *st, int nofollow);
+
+extern int open_at(int dir, const char *dirname,
+ const char *filename, int flags);
+
+extern FILE *fopen_at(int dir, const char *dirname, const char *filename,
+ int flags, const char *mode);
+
+extern ssize_t readlink_at(int dir, const char *dirname, const char *pathname,
+ char *buf, size_t bufsiz);
+
+
+#endif /* UTIL_LINUX_AT_H */