DO NOT MERGE Restore libcorkscrew unwinding.

Bug: 15701117
Change-Id: I1d2164726b8f421d8e6741b84749fddb86b60809
diff --git a/libbacktrace/Android.mk b/libbacktrace/Android.mk
index 0ae8839..80cd861 100644
--- a/libbacktrace/Android.mk
+++ b/libbacktrace/Android.mk
@@ -23,7 +23,7 @@
 	liblog \
 
 # To enable using libunwind on each arch, add it to this list.
-libunwind_architectures := arm arm64
+libunwind_architectures :=
 
 ifeq ($(TARGET_ARCH),$(filter $(TARGET_ARCH),$(libunwind_architectures)))