bug#45198: 28.0.50; Sandbox mode

[Alan Third]

On Wed, Dec 30, 2020 at 03:59:19PM +0100, Mattias Engdegård wrote:
> Here is a bare-bones macOS sandbox implementation. In practice, it
> would probably be called in an --eval argument to guard anything
> executed later. It should be sufficient for the typical untrusted
> flymake checker running in an Emacs subprocess and printing to
> stdout/stderr.

It may make more sense to use darwin instead of macos in the name,
unless it is actually specific to macOS.

I believe OpenDarwin is still a thing.

-- 
Alan Third