[Build] Add OpenAI triton_kernels (#28788)

Signed-off-by: Varun Sundar Rabindranath <vsundarr@redhat.com>
Co-authored-by: Varun Sundar Rabindranath <vsundarr@redhat.com>

vllm/model_executor/layers/quantization/utils/mxfp4_utils.py

@@ -8,6 +8,7 @@ import torch
 from vllm.logger import init_logger
 from vllm.platforms import current_platform
 from vllm.triton_utils import triton
+from vllm.utils.import_utils import has_triton_kernels
 from vllm.utils.torch_utils import direct_register_custom_op, is_torch_equal_or_newer
 
 logger = init_logger(__name__)
@@ -15,6 +16,7 @@ logger = init_logger(__name__)
 
 def _swizzle_mxfp4(quant_tensor, scale, num_warps):
     """weight swizzle for mxfp4 moe, used for OAI mxfp4 kernel"""
+    assert has_triton_kernels()
     import triton_kernels.matmul_ogs_details.opt_flags as opt_flags
     from triton_kernels.numerics import InFlexData
     from triton_kernels.tensor import FP4, convert_layout, wrap_torch_tensor