[Audit] In some cases the rpath normalisation pass doesn't do its job

[giordano]

See JuliaStats/Rmath-julia#44 (comment). A reproducer is this recipe, built for x86_64-apple-darwin. The library erroneously link to libgcc_s (but that's not the issue discussed here), but with full absolute path /workspace/destdir/x86_64-apple-darwin14/lib/libgcc_s.1.dylib, which doesn't get sanitized by the auditor.