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Link 32bit native libraries only if libs exist
There could be an app whose abi is 32bit, but which doesn't have 32bit native libs because it just belongs to the SharedUserId whose abi is 32bit. Link it only if libs exist to reduce unnecessary calls. Bug: 204097684 Test: compile & verify basic functions working Change-Id: I24c374c92600ff50f4cf4e88e0b4106d480562d8