libsForQt5.full: drop

[nim65s]

follows #435067

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[K900]

What do you have that uses that alias? We should really delete it tbh.

[nim65s]

I use that in devShells to build things that need Qt, when I'm not sure which Qt parts do I need or not.
In other words, I've just been lazy. Let's drop it instead.

[K900]

Needs to be conditional on allowAliases, I guess.