Merge pull request #247113 from Scrumplex/various-mainProgram

pkgs/applications/audio/mpc/default.nix

···
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = with platforms; unix;
+    mainProgram = "mpc";
   };
 }

pkgs/development/tools/jq/default.nix

···
     maintainers = with maintainers; [ raskin globin artturin ];
     platforms = platforms.unix;
     downloadPage = "https://stedolan.github.io/jq/download/";
+    mainProgram = "jq";
   };
 }

pkgs/misc/brightnessctl/default.nix

···
     license = licenses.mit;
     maintainers = with maintainers; [ megheaiulian ];
     platforms = platforms.linux;
+    mainProgram = "brightnessctl";
   };
 
 }

pkgs/tools/wayland/gtklock/default.nix

···
     license = licenses.gpl3;
     maintainers = with maintainers; [ dit7ya ];
     platforms = platforms.linux;
+    mainProgram = "gtklock";
   };
 }

pkgs/tools/wayland/wlogout/default.nix

···
     license = licenses.mit;
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = platforms.linux;
+    mainProgram = "wlogout";
   };
 }
 # TODO: shell completions