makefile: fix positional arguments for testsys

[webern]

Issue number:

Fixes a problem with #3342

N/A

Description of changes:

Testsys was broken because Twoliter was intercepting the -f in this command:

cargo make test -f /foo

This is because Clap didn't work the way we thought it did. This fixes the issue.

Testing done:

We checked all of the commands that use splatting of cargo make arguments (basically all of the the testsys makefile targets) to make sure testsys was being invoked correctly.

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[webern]

This build error appears unrelated to twoliter, assuming the other variant/arches pass:

ERROR: failed to solve: failed to authorize: failed to fetch oauth token: unexpected status from POST request to https://auth.docker.io/token: 503 Service Unavailable

[webern]

Similar

 ERROR: failed to solve: pulling from host registry-1.docker.io failed with status code [manifests 1.4.3]: 503 Service Unavailable