Remove DESIRED_CUDA logic from check_binary.sh

As [`pytorch/manylinux-builder`](https://hub.docker.com/r/pytorch/manylinux-builder) containers has only one version of CUDA, there is no need to select any

Nor setup `LD_LIBRARY_PATH` as it does not match the setup users might have on their system (but keep it for libtorch tests for now)

Should fix crash due to different minor version of cudnn installed in docker container and specified as dependency to a small wheel package, seen here https://github.com/pytorch/pytorch/actions/runs/5478547018/jobs/9980463690

check_binary.sh

@@ -51,21 +51,6 @@ else
   install_root="$(dirname $(which python))/../lib/python${py_dot}/site-packages/torch/"
 fi
 
-if [[ "$DESIRED_CUDA" != 'cpu' && "$DESIRED_CUDA" != 'cpu-cxx11-abi' && "$DESIRED_CUDA" != *"rocm"* ]]; then
-  # cu90, cu92, cu100, cu101
-  if [[ ${#DESIRED_CUDA} -eq 4 ]]; then
-    CUDA_VERSION="${DESIRED_CUDA:2:1}.${DESIRED_CUDA:3:1}"
-  elif [[ ${#DESIRED_CUDA} -eq 5 ]]; then
-    CUDA_VERSION="${DESIRED_CUDA:2:2}.${DESIRED_CUDA:4:1}"
-  fi
-  echo "Using CUDA $CUDA_VERSION as determined by DESIRED_CUDA"
-
-  # Switch `/usr/local/cuda` to the desired CUDA version
-  rm -rf /usr/local/cuda || true
-  ln -s "/usr/local/cuda-${CUDA_VERSION}" /usr/local/cuda
-  export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH
-fi
-
 ###############################################################################
 # Check GCC ABI
 ###############################################################################
@@ -311,6 +296,10 @@ build_example_cpp_with_incorrect_abi () {
 # Check simple Python/C++ calls
 ###############################################################################
 if [[ "$PACKAGE_TYPE" == 'libtorch' ]]; then
+  # NS: Set LD_LIBRARY_PATH for CUDA builds, but perhaps it should be removed
+  if [[ "$DESIRED_CUDA" == "cu"* ]]; then
+    export LD_LIBRARY_PATH=/usr/local/cuda/lib64
+  fi
   build_and_run_example_cpp simple-torch-test
   # `_GLIBCXX_USE_CXX11_ABI` is always ignored by gcc in devtoolset7, so we test
   # the expected failure case for Ubuntu 16.04 + gcc 5.4 only.