support arm64

Hi,

this documentation is helpful, https://github.com/doe300/VC4CL/wiki/How-to-get but there is something wrong with this command output.

curl "https://circleci.com/api/v1.1/project/github/doe300/VC4C/$(python ./build_num.py /tmp/json)/artifacts" --output /tmp/dump

it return html, I have to change branch to devel and then able to proceed to the next line of documentation.

also, it seem that the package is build for armhf? is it possible to include support for arm64? That would be fantastic and my o/s is ubuntu server.

Thank you.

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