cargo: avoid using system curl on darwin (again)

Modern versions of macOS link the system-provided curl library against
the system-provided libressl library. On recent versions of macOS, the
system libressl library reads from /private/etc/ssl/openssl.cnf. As this
path is not included in the default Nix sandbox profile, applications
that use the system curl library will report a permission error [1].

PR #300521 previously addressed this for the prebuilt cargo binary used
by the bootstrap version of cargo. It appears that rustc-unwrapped,
which includes its own cargo binary, has the same issue [2]. Similarly
patch it with `install_name_tool` to replace use of the system curl
library with one from nixpkgs.

[1]: https://github.com/NixOS/nix/issues/9625
[2]: https://gist.github.com/al3xtjames/645c8be2c23021aadfe062cfc319c8c4

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