Differential builds with on Darwin now enabled

[Ben Gamari]

Hello everyone,

Note that the Mac Mini builder will now build submitted Differentials as
well as commits to master.

Originally I was hesitant to take this step since unreviewed
differentials are essentially untrusted code; however it has become
clear that to keep regressions from entering the tree we will need to be
a bit more proactive in testing code before it is committed.

Hopefully this helps!

Lastly, I'd like to take this opportunity to once again thank Futurice
for providing this hardware to us. We all owe them a debt of gratitude.

Cheers,

- Ben
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