Fix Mac build breakage due to Tsan annotations.

Change-Id: I3bdfd4f3e0fc8db7274cfe8a14d2a01b23207aff
diff --git a/Android.mk b/Android.mk
index c59e55c..c094c8d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -2,7 +2,7 @@
 MCLD_ROOT_PATH := $(LOCAL_PATH)
 # For mcld.mk
 LLVM_ROOT_PATH := external/llvm
-MCLD_ENABLE_ASSERTION := true
+MCLD_ENABLE_ASSERTION := false
 
 include $(CLEAR_VARS)