Support for Android

[FlorianStasse]

I updated some small parts both in keygen-rs and tauri-plugin-keygen-rs2 to make it work with Android:

• I switched reqwest to the rustls feature which bypasses openssl (that is not easily available on Android)
• I updated the build script for tauri-plugin-keygen-rs2 which was failling to build because it's not setup properly
• I disabled machine_uid on the Android target, which make the "get_fingerprint" function return an empty string on Android, and the same value as before on other os.

I have developped a private tauri plugin to retrieve the machine id that wraps around machine_uid on desktop but uses some small kotlin code for Android (and I will add the required swift code for iOS). I may make it public in the coming months, so you might be able to use the plugin instead of directly calling machine_uid.

[ahonn]

I disabled machine_uid on the Android target, which make the "get_fingerprint" function return an empty string on Android, and the same value as before on other os.

This modification does not solve the issue. It will cause the machine fingerprint to be an empty string on Android, causing the deactivate/checkout machine to fail.

[ahonn]

I prefer to wait until you release this plugin before making relevant modifications to support Android/iOS.

[FlorianStasse]

I won't be able to do it before a few weeks, I'll update this PR and ping you when it's done.