Actually add a cleanspec line.

CleanSpec works by executing added lines (I removed one in last commit,
so the commit was essentially a no-op).

Test: m
Change-Id: I1c613a87adbfe4aae1d4a71bc09f6aee65badb4d
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 584899c..55c7285 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -59,6 +59,7 @@
 
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/nativetest*/art_libdexfile_support_tests/dex_file_supp_test)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/nativetest*/)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/nativetest*/)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST