Is there a way to mock the target_os config for a specific crate?

Question

I want to add the dependency mac_address to my crate, that doesn't officially support the target os android. I observed that mac_address compiles for android by just adding target_os = "android" to the conditional compiling blocks of that crate.

So I forked it, made my modifications, opened a pull request and I'm currently using this dependency from my forked git repository, not as a crate on crates.io like so:

[dependencies]
my_dep = { git = "https://github.com/myself/my_dep" }

No problems so far. My problem is that now I'm planning to publish my crate on crates.io and for doing so I need to exclusively use crates from crates.io. My question is: is there a way to tell cargo to compile mac_address while mimicking to be a different target_os? Or more generally can I specify to cargo to treat my system as a different target_os?

I tried using cargo --config 'target_os="linux"' build but without success