quartus: split out unwrapped package

This allows customizing the install process for the unwrapped process,
as proposed in #123469, without introducing top-level support for
untested modifications.

The PR could then be straightforwardly implemented as an overlay, that
does:

  quartus-prime-lite = super.quartus-prime-lite.override {
    unwrapped = quartus-prime-lite.unwrapped.overrideAttrs (o: {
      buildCommand = o.buildCommand + ''
        rm -r $out/nios2eds/bin/gnu
        find $out/modelsim_ase/altera/{verilog,vhdl}/* ! -name src ! -path '*twentynm*' -delete
      '';
    });
  };

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