Fix bug where onnxruntime_USE_NCCL flag would default to ON (#12195)

Fix bug where onnxruntime_USE_NCCL flag would default to ON, causing ORT to not build properly. New functionality: flag is ON when training is enabled and NCCL is not disabled. Flag is OFF otherwise

tools/ci_build/build.py

@@ -885,7 +885,7 @@ def generate_build_tree(
         "-Donnxruntime_ENABLE_TRAINING_TORCH_INTEROP=" + ("ON" if args.enable_training_torch_interop else "OFF"),
         # Enable advanced computations such as AVX for some traininig related ops.
         "-Donnxruntime_ENABLE_CPU_FP16_OPS=" + ("ON" if args.enable_training else "OFF"),
-        "-Donnxruntime_USE_NCCL=" + ("OFF" if args.disable_nccl else "ON"),
+        "-Donnxruntime_USE_NCCL=" + ("ON" if args.enable_training and not args.disable_nccl else "OFF"),
         "-Donnxruntime_BUILD_BENCHMARKS=" + ("ON" if args.build_micro_benchmarks else "OFF"),
         "-Donnxruntime_USE_ROCM=" + ("ON" if args.use_rocm else "OFF"),
         "-DOnnxruntime_GCOV_COVERAGE=" + ("ON" if args.code_coverage else "OFF"),