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abuild no longer depends on sudo, so we need to make sure to install it.

This is a dependency required to build gcc with ada support, but cannot
be added as a makedepends because that would create a circular
dependency.

So pre-install it so that it's available already.

sudo does not like it when it's world readable.

Sudo started to emit the warning:

> setrlimit(RLIMIT_CORE): Operation not permitted

This is a [known issue][redhat-bug], and there is a workaround, so lets
add that workaround to reduce the noise.

[redhat-bug]: https://bugzilla.redhat.com/show_bug.cgi?id=1773148