python312Packages.tiny-cuda-nn: mark as broken when !cudaSupport

Without it, the build phase fails because CUDA_HOME is None in
torch's CppExtension (because `torch.cuda._is_compiled` is false).

https://github.com/pytorch/pytorch/blob/cb4cd6166e5f6d7c0180dcca27454691ef910625/torch/utils/cpp_extension.py#L243

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>

pkgs/by-name/ti/tiny-cuda-nn/package.nix

@@ -1,4 +1,5 @@
 {
+  config,
   cmake,
   cudaPackages,
   fetchFromGitHub,
@@ -176,7 +177,11 @@ stdenv.mkDerivation (finalAttrs: {
     license = licenses.bsd3;
     maintainers = with maintainers; [ connorbaker ];
     platforms = platforms.linux;
-    # g++: error: unrecognized command-line option '-mf16c'
-    broken = stdenv.hostPlatform.isAarch64;
+    badPlatforms = [
+      # g++: error: unrecognized command-line option '-mf16c'
+      lib.systems.inspect.patterns.isAarch64
+    ];
+    # Requires torch.cuda._is_compiled() == True to build
+    broken = !config.cudaSupport;
   };
 })