Comment 3 for bug 1818552

This thread sheds more light on why it is a good idea to disable a.out support:

  https://lore.kernel<email address hidden>/

Specifically, the coredump support is broken/buggy and that's addressed in this patch:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=08300f4402abc0eb3bc9c91b27a529836710d32d

a.out support, in general, is now deprecated and will likely be removed in a few upstream releases:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eac616557050737a8d6ef6fe0322d0980ff0ffde

Since we only had a.out enabled in i386 and armhf configs, I think we're better off simply disabling the config option, rather than backporting the patch that rips out coredumping. We'll do this for Xenial and newer releases.