Add SELinux support

Change-Id: I11e1a3d018d921d96ba08915925b14bf633be6ed
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index e31ec8e..74923a0 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -46,7 +46,9 @@
 RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libflashutils.so
 RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libstlport.so
 #RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libmincrypt.so
-RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libext4_utils.so
+ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
+    RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libext4_utils.so
+endif
 RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libaosprecovery.so
 RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libjpeg.so
 ifneq ($(wildcard external/libselinux/Android.mk),)