wlroots_0_18: drop

The libinput update in PR #493438 broke the build,
and we don't seem to need it anymore.

pkgs/by-name/ga/gamescope/package.nix

@@ -42,7 +42,7 @@
   glslang,
   hwdata,
   stb,
-  wlroots_0_18,
+  wlroots_0_19,
   libdecor,
   lcms,
   lib,
@@ -159,7 +159,7 @@ stdenv.mkDerivation (finalAttrs: {
     vulkan-headers
   ]
   ++ lib.optionals enableExecutable (
-    wlroots_0_18.buildInputs
+    wlroots_0_19.buildInputs
     ++ [
       # gamescope uses a custom wlroots branch
       libxcomposite

pkgs/development/libraries/wlroots/default.nix

@@ -162,11 +162,6 @@ let
 
 in
 {
-  wlroots_0_18 = generic {
-    version = "0.18.3";
-    hash = "sha256-D8RapSeH+5JpTtq+OU8PyVZubLhjcebbCBPuSO5Q7kU=";
-  };
-
   wlroots_0_19 = generic {
     version = "0.19.3";
     hash = "sha256-J+wSVUtuizaCyCn523chFbE8VtbPjyu5XYv5eLT+GM0=";

pkgs/top-level/aliases.nix

@@ -2208,6 +2208,7 @@ mapAliases {
   wireshark-qt = warnAlias "'wireshark-qt' has been renamed to/replaced by 'wireshark'" wireshark; # Added 2026-01-23
   wkhtmltopdf-bin = throw "'wkhtmltopdf-bin' has been renamed to/replaced by 'wkhtmltopdf'"; # Converted to throw 2025-10-27
   wlroots_0_17 = throw "'wlroots_0_17' has been removed in favor of newer versions"; # Added 2026-03-07
+  wlroots_0_18 = throw "'wlroots_0_18' has been removed in favor of newer versions"; # Added 2026-05-13
   wlx-overlay-s = throw "'wlx-overlay-s' and 'wayvr-dashboard' have been merged into a single application. Please switch to 'wayvr'"; # Added 2026-01-09
   wmii_hg = throw "'wmii_hg' has been renamed to/replaced by 'wmii'"; # Converted to throw 2025-10-27
   wolfssl = throw "'wolfssl' has been removed because it has an unclear licensing situation and no remaining users in Nixpkgs"; # Added 2026-04-03

pkgs/top-level/all-packages.nix

@@ -9498,7 +9498,6 @@ with pkgs;
     ;
 
   inherit (callPackages ../development/libraries/wlroots { })
-    wlroots_0_18
     wlroots_0_19
     wlroots_0_20
     ;