Enable art for user builds

Bug: 10069754
Change-Id: Iaaff33a97bd7b68b2e8d84cd0034b15dde8a4316
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 77b239b..e2e76b8 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -56,7 +56,9 @@
 
 $(_dbj_jar_no_dex) : $(_dbj_src_jar) | $(ACP) $(AAPT)
 	$$(call copy-file-to-target)
+ifneq ($(DEX_PREOPT_DEFAULT),nostripping)
 	$$(call dexpreopt-remove-classes.dex,$$@)
+endif
 
 $(eval _dbj_jar :=)
 $(eval _dbj_odex :=)