prismlauncher,prismlauncher-qt5: add separate qt5 and qt6 aliases
prismlauncher,prismlauncher-qt5: add separate qt5 and qt6 aliases

This one shouldn't get backported because qt6 packaging has a bunch of unresolved issues in 22.05

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs