The CI build script is useful to build OBS Studio even outside the CI
environment. However, the current script hard codes adding the 'amd64'
architecture to dpkg, the Debian/Ubuntu package management database.
This breaks the system when run on non-x86 machines. e.g., a
linux-aarch64 VM running on an Apple silicon macbook. Fixing the system
requires telling dpkg to remove 'amd64' again with 'sudo dpkg
--remove-architecture amd64'
As the CI build always runs on an amd64 machine, adding amd64 is not
necessary and can be safely removed.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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