lapack: fix darwin library identifiers

The build system already sets these properly to the absolute path so no
need to patch the libraries on darwin.

    $ otool -D result/lib/liblapacke.dylib
    result/lib/liblapacke.dylib:
    /nix/store/k88gy5s765yn3dc5ws3jbykyvklm7z96-openblas-0.3.8/lib/libopenblasp-r0.3.8.dylib

Fixes #85713