Use Mac OS X SDK 10.6.

Change-Id: I8ca16db2fb93d350829e14f4339e7ece75a2fb54
diff --git a/CleanSpec.mk b/CleanSpec.mk
index b1b139a..13be820 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -127,6 +127,9 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/app/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
+# Now we switched to build against Mac OS X SDK 10.6
+$(call add-clean-step, rm -rf $(OUT_DIR)/host/linux-x86/obj)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************