vold: suppress unused argument warning messages

Change-Id: Ic1ab533f756fbd44b1f2e5ae12e2f5736ace7740
diff --git a/cryptfs.h b/cryptfs.h
index e4010be..dc3ce3e 100644
--- a/cryptfs.h
+++ b/cryptfs.h
@@ -56,8 +56,7 @@
 #define KDF_PBKDF2 1
 #define KDF_SCRYPT 2
 
-#define __le32 unsigned int
-#define __le16 unsigned short int
+/* __le32 and __le16 defined in system/extras/ext4_utils/ext4_utils.h */
 #define __le8  unsigned char
 
 struct crypt_mnt_ftr {