fix for link error: libnccl.so.2 can not be found

[GuangguanWang]

fix for link error: libnccl.so.2 can not be found.

link error happens when run bash build.sh in Python 3.10.12

[9/9] /usr/local/cuda/bin/nvcc /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/cuda_driver.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/nccl.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/nvshmem.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/internode.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/internode_ll.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/intranode.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/layout.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/python_api.o -o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/dlink.o -D__CUDA_NO_HALF_OPERATORS__ -D__CUDA_NO_HALF_CONVERSIONS__ -D__CUDA_NO_BFLOAT16_CONVERSIONS__ -D__CUDA_NO_HALF2_OPERATORS__ --expt-relaxed-constexpr --compiler-options ''"'"'-fPIC'"'"'' -dlink -L/root/miniconda3/envs/deepepv2/lib/python3.10/site-packages/nvidia/nvshmem/lib -lnvshmem_device -DTORCH_API_INCLUDE_EXTENSION_H -DTORCH_EXTENSION_NAME=_C -gencode=arch=compute_90,code=sm_90
g++ -pthread -B /root/miniconda3/envs/deepepv2/compiler_compat -Wno-unused-result -Wsign-compare -DNDEBUG -fwrapv -O2 -Wall -fPIC -O2 -isystem /root/miniconda3/envs/deepepv2/include -fPIC -O2 -isystem /root/miniconda3/envs/deepepv2/include -shared /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/cuda_driver.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/nccl.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/nvshmem.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/internode.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/internode_ll.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/intranode.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/legacy/layout.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/python_api.o /mnt/deepep-v2/DeepEP/build/temp.linux-x86_64-cpython-310/csrc/kernels/backend/dlink.o -L/root/miniconda3/envs/deepepv2/lib/python3.10/site-packages/nvidia/nvshmem/lib -L/root/miniconda3/envs/deepepv2/lib/python3.10/site-packages/torch/lib -L/usr/local/cuda/lib64 -lc10 -ltorch -ltorch_cpu -ltorch_python -lcudart -lc10_cuda -ltorch_cuda -o build/lib.linux-x86_64-cpython-310/deep_ep/_C.cpython-310-x86_64-linux-gnu.so -lcuda -l:libnvshmem_host.so.3 -l:libnvshmem_device.a -Wl,-rpath,/root/miniconda3/envs/deepepv2/lib/python3.10/site-packages/nvidia/nvshmem/lib -l:libnccl.so.2 -Wl,-rpath,/root/miniconda3/envs/deepepv2/lib/python3.10/site-packages/nvidia/nccl/lib
/root/miniconda3/envs/deepepv2/compiler_compat/ld: cannot find -l:libnccl.so.2: No such file or directory
collect2: error: ld returned 1 exit status
error: command '/usr/bin/g++' failed with exit code 1