polipo: drop

Upstream hasn't seen activity since 2014 and archived the project in 2021. There's no longer a need for HTTP proxies

Author: patka-123

pkgs/by-name/po/polipo/package.nix

@@ -1540,6 +1540,7 @@ mapAliases {
 
   PlistCpp = plistcpp; # Added 2024-01-05
   pocket-updater-utility = pupdate; # Added 2024-01-25
+  polipo = throw "'polipo' has been removed as it is unmaintained upstream"; # Added 2025-05-18
   poppler_utils = poppler-utils; # Added 2025-02-27
   powerline-rs = throw "'powerline-rs' has been removed due to lack of upstream maintenance"; # Added 2025-01-26
   premake3 = throw "'premake3' has been removed since it is unmaintained. Consider using 'premake' instead"; # Added 2025-05-10