glslang: add throwing aliases for removed passthru packages

Signed-off-by: Marcin Serwin <marcin@serwin.dev>

pkgs/by-name/gl/glslang/package.nix

@@ -6,6 +6,7 @@
   python3,
   spirv-headers,
   spirv-tools,
+  config,
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "glslang";
@@ -45,6 +46,14 @@ stdenv.mkDerivation (finalAttrs: {
     ln -s $bin/bin/glslang $bin/bin/glslangValidator
   '';
 
+  passthru = lib.optionalAttrs config.allowAliases {
+    # Added 2026-01-06, https://github.com/NixOS/nixpkgs/pull/477412
+    spirv-tools = throw "'glslang' no longer pins to specific 'spirv-tools'";
+
+    # Added 2026-01-06, https://github.com/NixOS/nixpkgs/pull/477412
+    spirv-headers = throw "'glslang' no longer pins to specific 'spirv-headers'";
+  };
+
   meta = {
     inherit (finalAttrs.src.meta) homepage;
     description = "Khronos reference front-end for GLSL and ESSL";