Also, tweak the XQuartz requirement to not show 0.0.0 versions being required.
ClosesHomebrew/homebrew#35254.
Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
By always passing around a single, unnested array rather than splatting
and then defensively flattening and compacting things, we can avoid
allocating a bunch of unnecessary arrays. This gives a performance boost
of roughly 4% when enumerating 2500 formulae, and has the side effect of
cleaning up the dependency API.
