[HIPIFY][tests] Set -I for CUDA path instead of --cuda-path for LLVM < 4

tests/hipify-clang/lit.cfg

@@ -124,7 +124,11 @@ elif config.cuda_cub_root:
 else:
     config.substitutions.append(("%clang_args", clang_arguments % config.cuda_sdk_root))
 
-hipify_arguments = "--cuda-path='%s'"
+if config.llvm_version_major < 4:
+    hipify_arguments = "-I'%s'/include"
+else:
+    hipify_arguments = "--cuda-path='%s'"
+
 config.substitutions.append(("%hipify_args", hipify_arguments % config.cuda_root))
 config.substitutions.append(("hipify", '"' + hipify_path + "/hipify-clang" + '"'))
 config.substitutions.append(("%run_test", '"' + config.test_source_root + "/run_test" + run_test_ext + '"'))