[Unison-hackers] mac.app fixes and 2.51.4

[Greg Troxel]

I would really like to get this in for 2.51.4, given the users' list
traffic, but it will need some Mac users to test/etc.

https://github.com/bcpierce00/unison/pull/423

I do have a mac at 10.13 but it will take me until at least next week to
look at it.

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