use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/xgetpass.h b/libblkid/xgetpass.h
new file mode 100644
index 0000000..b5a3c87
--- /dev/null
+++ b/libblkid/xgetpass.h
@@ -0,0 +1,6 @@
+#ifndef UTIL_LINUX_XGETPASS_H
+#define UTIL_LINUX_XGETPASS_H
+
+extern char *xgetpass(int pfd, const char *prompt);
+
+#endif /* UTIL_LINUX_XGETPASS_H */