Add $ORIGIN/lib[64] to host binary's rpath.

Normally the binaries use the exsiting $ORIGIN/../lib[64] with binaries
in the bin subdirectory;
For historical reason the binaries in the SDK package don't have a bin
subdirectory. This workaround enables them to work in the existing SDK
directory structure.

Bug: 21301578
Change-Id: Ibebfbfb8b30e81e7bbaf13a21bb205f3f0282d24
(cherry-pick from commit 4fe7bfd3)