shader-slang: mark LLVM support broken

pkgs/by-name/sh/shader-slang/package.nix

@@ -11,7 +11,7 @@
   libX11,
   glslang,
   unordered_dense,
-  llvmPackages_14,
+  llvmPackages,
   versionCheckHook,
   gitUpdater,
 
@@ -73,10 +73,8 @@ stdenv.mkDerivation (finalAttrs: {
     libX11
   ]
   ++ lib.optionals withLLVM [
-    # Slang only supports LLVM 14:
-    # https://github.com/shader-slang/slang/blob/v2025.15/docs/building.md#llvm-support
-    llvmPackages_14.llvm
-    llvmPackages_14.libclang
+    llvmPackages.llvm
+    llvmPackages.libclang
   ]
   ++ lib.optionals withGlslang [
     # SPIRV-tools is included in glslang.
@@ -150,5 +148,8 @@ stdenv.mkDerivation (finalAttrs: {
     maintainers = with lib.maintainers; [ niklaskorz ];
     mainProgram = "slangc";
     platforms = lib.platforms.all;
+    # Slang only supports LLVM 14:
+    # https://github.com/shader-slang/slang/blob/v2025.15/docs/building.md#llvm-support
+    broken = withLLVM;
   };
 })