In theory commit 7b07d77396 already
did that, but in practice it ended up picking a commit from the
1.8.2405 branch, where a few of our tests fail. Since I hope to
soon enable DXC for macOS again, it's useful to fix that oversight.
The previous Intel-based macOS runner was replaced with another one
running as a virtual machine on top of an Apple Silicon host.
Since the current macOS runner is not yet able to deal with
different exit codes, we temporarily allow failure unconditionally.
This will be reverted as soon as the runner issue is fixed.
