rust-cpython: fix build for MacOSX MacOSX needs special link flags. Quoting the README of rust-cpython: create a `.cargo/config` with the following content: ``` [target.x86_64-apple-darwin] rustflags = [ "-C", "link-arg=-undefined", "-C", "link-arg=dynamic_lookup", ] ``` This is tested with Python 2.7 (Anaconda install) and Python 3 (Homebrew install)

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{

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    "conduit_uri": "https://phab.mercurial-scm.org/api",

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    "repository.callsign": "HG",

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    "arc.land.onto.default": "@",

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    "base": "hg:.^"

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}