Hide symbols from the unwinder.

Bug: 18471342
Bug: 19958712
Change-Id: I4a966262680dcf57e9d9481cb9406e1092c7f243
diff --git a/Android.mk b/Android.mk
index e3f25ff..2afae8f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -73,6 +73,7 @@
 LOCAL_SHARED_LIBRARIES := libdl
 LOCAL_CXX_STL := none
 LOCAL_STATIC_LIBRARIES_arm := libunwind_llvm
+LOCAL_LDFLAGS_arm := -Wl,--exclude-libs,libunwind_llvm.a
 include $(BUILD_SHARED_LIBRARY)
 
 # host static lib