add mmap() MAP_JIT flag on Darwin for macOS Hardened Runtime

Closed Bitbucket Importer requested to merge topic/default/bitbucket-pr-635 into branch/default

Created originally on Bitbucket by lunixbochs (Ryan Hileman)

This allows PyPy to be codesigned with Hardened Runtime on macOS Mojave with instead of by mapping executable pages using the MAP_JIT flag to mmap. I’ve confirmed this flag exists at least back to 10.11 (El Capitan). I don’t know exactly how these defines get codegen'd so I’m not sure if I handled the linux/windows compilation case correctly.

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