Allow building as dependency on docs.rs with no features enabled #199
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In
winit, we have to artificially enable an activity to get the docs to build on Android, which is kinda annoying:https://github.com/rust-windowing/winit/blob/969237f422e3d1d18821f4ee99e6be7bb6acd913/Cargo.toml#L125-L126
Instead, this PR proposes to handle that logic internally in
android-activity, by relying on the fact that docs.rs sets an environment variable (see their docs).