liquidfun: remove

I attempted to bisect when liquidfun stopped building successfully; I couldn't find a specific commit becuase sometimes I was unable to build for reasons not related to this package, but I narrowed it down to inbetween:

- 93228a0863 2015-03-24: builds successfully
- 414b3f2909 2015-05-18: fails to build

This means that no one has been using this liquidfun package for 10 years.

pkgs/by-name/li/liquidfun/package.nix

@@ -1,57 +0,0 @@
-{
-  lib,
-  stdenv,
-  requireFile,
-  cmake,
-  libGLU,
-  libGL,
-  libX11,
-  libXi,
-}:
-
-stdenv.mkDerivation rec {
-  pname = "liquidfun";
-  version = "1.1.0";
-
-  src = requireFile {
-    url = "https://github.com/google/liquidfun/releases/download/v${version}/liquidfun-${version}";
-    sha256 = "5011a000eacd6202a47317c489e44aa753a833fb562d970e7b8c0da9de01df86";
-    name = "liquidfun-${version}.tar.gz";
-  };
-
-  nativeBuildInputs = [ cmake ];
-  buildInputs = [
-    libGLU
-    libGL
-    libX11
-    libXi
-  ];
-
-  sourceRoot = "liquidfun/Box2D";
-
-  preConfigurePhases = [ "preConfigure" ];
-
-  preConfigure = ''
-    sed -i Box2D/Common/b2Settings.h -e 's@b2_maxPolygonVertices .*@b2_maxPolygonVertices 15@'
-    substituteInPlace Box2D/CMakeLists.txt --replace "Common/b2GrowableStack.h" "Common/b2GrowableStack.h Common/b2GrowableBuffer.h"
-  '';
-
-  configurePhase = ''
-    runHook preConfigure
-
-    mkdir Build
-    cd Build;
-    cmake -DBOX2D_INSTALL=ON -DBOX2D_BUILD_SHARED=ON -DCMAKE_INSTALL_PREFIX=$out ..
-
-    runHook postConfigure
-  '';
-
-  meta = {
-    description = "2D physics engine based on Box2D";
-    maintainers = with lib.maintainers; [ qknight ];
-    platforms = lib.platforms.linux;
-    hydraPlatforms = [ ];
-    license = lib.licenses.bsd2;
-    homepage = "https://google.github.io/liquidfun/";
-  };
-}

pkgs/top-level/aliases.nix

@@ -957,6 +957,7 @@ mapAliases {
   linuxPackages_xen_dom0 = throw "'linuxPackages_xen_dom0' has been renamed to/replaced by 'linuxPackages'"; # Converted to throw 2025-10-27
   linuxPackages_xen_dom0_hardened = throw "'linuxPackages_xen_dom0_hardened' has been renamed to/replaced by 'linuxPackages_hardened'"; # Converted to throw 2025-10-27
   linuxstopmotion = throw "'linuxstopmotion' has been renamed to/replaced by 'stopmotion'"; # Converted to throw 2025-10-27
+  liquidfun = throw "liquidfun has been removed, as it has failed to build (and so presumed unused) for 10 years"; # Added 2025-12-19
   Literate = throw "'Literate' has been renamed to/replaced by 'literate'"; # Converted to throw 2025-10-27
   littlenavmap = throw "littlenavmap has been removed as it depends on KDE Gear 5, which has reached EOL"; # Added 2025-08-20
   live-chart = throw "live-chart has been removed as it is no longer used in Nixpkgs. livechart-2 (elementary's fork) is available as pantheon.live-chart"; # Added 2025-10-10