spirv-llvm-translator: mark as broken for LLVM 21 with SPIRV Headers 1.4.321

pkgs/by-name/sp/spirv-llvm-translator/package.nix

@@ -133,5 +133,13 @@ stdenv.mkDerivation {
     license = licenses.ncsa;
     platforms = platforms.unix;
     maintainers = with maintainers; [ gloaming ];
+
+    # For the LLVM 21 build some commits to spirv-headers
+    # are required that didn't make it into the final release of 1.4.321
+    # For example: 9e3836d Add SPV_INTEL_function_variants
+    # Once spirv-headers are released again and updated on nixpkgs,
+    # this will switch over to the nixpkgs version and should no
+    # longer be broken.
+    broken = llvmMajor == "21" && lib.versionOlder spirv-headers.version "1.4.322";
   };
 }