Auto merge of #14530 - mmatyas:android_injectedglue, r=larsbergstrom

Use `android-rs-injected-glue` on Android

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Due to changes in `android-rs-glue`, currently the Android build fails to start. As discussed [here](https://github.com/servo/servo/issues/13154), other than the `android-glue`, we now also have to inject some additional code too. This task is usually done by a helper program of `android-glue`, `cargo-apk`, but since Servo's build system is somewhat more complex than a regular small application, at the moment it'd be more clean to move the required internal `injected-glue` lib to a new repository, and add it as a dependency.

This patch adds a new dependency, `android-rs-injected-glue`, and integrates it into Servo. After applying this commit and #14528, Servo can be launched on Android. (It doesn't *work* yet as expected, though.)

Part of #13154.

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- [x] `./mach test-tidy` does not report any errors

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