disable wheel relocation for aarch builds

[pmeier]

We have an ongoing CI failure for the aarch64 builds after #7834, e.g. https://github.com/pytorch/vision/actions/runs/5892600360/job/15982284257

The jobs fail, because we are building on Linux and thus wheel relocation is enabled

vision/packaging/wheel/relocate.py

Lines 16 to 18 in 74f50d9

	# Third party imports
	if sys.platform == "linux":
	from auditwheel.lddtree import lddtree

but aarch64 builds no longer install auditwheel:

vision/packaging/pre_build_script.sh

Line 14 in 74f50d9

if [[ "$(uname)" == Darwin || "$OSTYPE" == "msys" || "$ARCH" == "aarch64" ]]; then

vision/packaging/pre_build_script.sh

Lines 26 to 36 in 74f50d9

	else
	# Install native CentOS libJPEG, freetype and GnuTLS
	yum install -y libjpeg-turbo-devel freetype gnutls
	# Download all the dependencies required to compile image and video_reader
	# extensions
	mkdir -p ext_libraries
	pushd ext_libraries
	popd
	export PATH="$(pwd)/ext_libraries/bin:$PATH"
	pip install auditwheel

There are two possible options here:

1. aarch wheels don't need relocation. This is the assumption I made in this PR, since that might be what Pre-Script Update for Aarch64 #7834 was about. Thus, I fixed our relocation script to only import auditwheel on Linux x86

2. aarch wheels need relocation. That sounds more likely to me. In this case, we can revert the changes I made to relocate.py and apply something like

   diff --git a/packaging/pre_build_script.sh b/packaging/pre_build_script.sh
   index 7d38f2cb4e..085b90a850 100644
   --- a/packaging/pre_build_script.sh
   +++ b/packaging/pre_build_script.sh
   @@ -33,7 +33,6 @@ else
      pushd ext_libraries
      popd
      export PATH="$(pwd)/ext_libraries/bin:$PATH"
   -  pip install auditwheel
    
      # Point to custom libraries
      export LD_LIBRARY_PATH=$(pwd)/ext_libraries/lib:$LD_LIBRARY_PATH
   @@ -41,5 +40,9 @@ else
      export TORCHVISION_LIBRARY=$(pwd)/ext_libraries/lib
    fi
    
   +if [[ "$(uname)" == Linux ]]; then
   +  pip install auditwheel
   +fi
   +
    pip install numpy pyyaml future ninja
    pip install --upgrade setuptools

cc @seemethere

[pytorch-bot]

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As of commit cb8e8a2 with merge base 2c44eba ():

NEW FAILURE - The following job has failed:

• bc (gh)

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[atalman]

I think we should probably revert #7834 linux aarch64 build should follow almost same logic as linux builds. Let me move the code in this PR to vision:
pytorch/test-infra#4464

if [[ ${{ inputs.architecture }} == 'aarch64' ]]; then
            ${CONDA_RUN} conda install -y libpng jpeg
            ${CONDA_RUN} conda install libpng -yq
            ${CONDA_RUN} conda install -yq ffmpeg=4.2 libjpeg-turbo -c pytorch-nightly
          fi

[pmeier]

Superseded by #7872.