Build salt minion on armhf/arm64 Debian buster

Small changes to my arm salt install setup were needed on Debian Buster.

# Install dependencies
apt-get install build-essential cython3 libyaml-dev python3-dev python3-psutil python3-pycryptodome python3-software-properties python3-virtualenv python3-yaml virtualenv 

# Create a virtualenv 
virtualenv --python /usr/bin/python3 --system-site-packages env
. env/bin/activate
pip install salt
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