lua.pkgs.luv.libluv: fix linking against lua on darwin
lua.pkgs.luv.libluv: fix linking against lua on darwin

    [ 50%] Building C object CMakeFiles/luv.dir/src/luv.c.o
    [100%] Linking C shared library libluv.dylib
    Undefined symbols for architecture x86_64:
      "_luaL_addlstring", referenced from:
          _thread_dump in luv.c.o
      ...

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