ext4_utils: Abstracting ext4 encryption property system

Change-Id: Iddca42328e9249eb09eb68e6d5339a02cfebecd0
diff --git a/ext4_utils/Android.mk b/ext4_utils/Android.mk
index 964f666..76dd453 100644
--- a/ext4_utils/Android.mk
+++ b/ext4_utils/Android.mk
@@ -54,7 +54,8 @@
 
 libext4_utils_src_files += \
     ext4_crypt.cpp \
-    e4crypt_static.c
+    e4crypt_static.c \
+    unencrypted_properties.cpp
 
 ifneq ($(HOST_OS),windows)