qt5: Expose internal variables to facilitate out-of-tree building of modules

As it is currently it's almost impossible to accomplish something like:
```nix
...

(qt5.callPackage (
  { qtModule, qtbase, qtdeclarative }:
  qtModule {
    pname = "qt3d";
    qtInputs = [ qtbase qtdeclarative ];
    outputs = [ "out" "dev" "bin" ];
  }
) { })

...
```
because all the required variables such as qtModule are internal-only.

By exposing these it's easier for external projects not to be bound
exactly by the module definitions explicitly listed in nixpkgs.

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