Cycles: add hardware raytracing support to oneAPI device

Updated Embree 4 library with GPU support is required for it to be
compiled - compatiblity with Embree 3 and Embree 4 without GPU support
is maintained.
Enabling hardware raytracing is an opt-in user setting for now.

Pull Request: https://projects.blender.org/blender/blender/pulls/106266

intern/cycles/blender/python.cpp

@@ -1034,6 +1034,14 @@ void *CCL_python_module_init()
   Py_INCREF(Py_False);
 #endif /* WITH_EMBREE */
 
+#ifdef WITH_EMBREE_GPU
+  PyModule_AddObject(mod, "with_embree_gpu", Py_True);
+  Py_INCREF(Py_True);
+#else  /* WITH_EMBREE_GPU */
+  PyModule_AddObject(mod, "with_embree_gpu", Py_False);
+  Py_INCREF(Py_False);
+#endif /* WITH_EMBREE_GPU */
+
   if (ccl::openimagedenoise_supported()) {
     PyModule_AddObject(mod, "with_openimagedenoise", Py_True);
     Py_INCREF(Py_True);