Removed APT config from the top-level scope since it does not apply to macOS X,
but only to the two Linux builds.
Although this required duplication of the APT config for bc and ed package
installation, this makes it much clearer as to what needs to happen for us to be
able to drop the sudo requirement for each of our Linux builds, and enable us
to use the faster, more efficient container-based infrastructure.
Removed APT config from the top-level scope since it does not apply to macOS X, but only to the two Linux builds.
Although this required duplication of the APT config for
bcandedpackage installation, this makes it much clearer as to what needs to happen for us to be able to drop thesudorequirement for each of our Linux builds, and enable us to use the faster, more efficient container-based infrastructure.