Remove libsigchain from LD_PRELOADs

Bug: 15345057
Bug: 15426766

(cherry picked from commit c9f9f35efa43b3ac75b1a7e76fe1071a2e9d52ea)

Change-Id: If54e1aeaa1e2abe061ac19666af4f4e058b81df2
1 file changed