Make it backwards compatible with 4.4

Change-Id: I668604cddc8e8afbf78709f3f872bea4e9f4aa06
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index c5b46df..538be71 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -117,8 +117,10 @@
         RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libcorkscrew.so
     endif
 endif
-#RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libmincrypttwrp.so
-#RELINK_SOURCE_FILES += $(TARGET_RECOVERY_ROOT_OUT)/sbin/toolbox
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 24; echo $$?),0)
+    RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libmincrypttwrp.so
+endif
+RELINK_SOURCE_FILES += $(TARGET_RECOVERY_ROOT_OUT)/sbin/toolbox
 ifneq ($(TW_OEM_BUILD),true)
     RELINK_SOURCE_FILES += $(TARGET_RECOVERY_ROOT_OUT)/sbin/twrp
 else