Use /system/lib64 and /vendor/lib64 for 64-bit libraries.

Change-Id: I4886aeb3070bf97b4cfe8053388ecb1bda288017
diff --git a/linker/linker.cpp b/linker/linker.cpp
index d218590..8f613b1 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -90,8 +90,13 @@
 static soinfo* somain; /* main process, always the one after libdl_info */
 
 static const char* const gSoPaths[] = {
+#if __LP64__
+  "/vendor/lib64",
+  "/system/lib64",
+#else
   "/vendor/lib",
   "/system/lib",
+#endif
   NULL
 };