Fix packaging of rust plugins on Android
The variant is disabled by default for many reasons, but people can build it manually. It's the only way to reliably get Rust plugins for iOS and Android.
This MR also fixes codepaths for iOS, but iOS is untested.
- Cargo is only building static archives, but we don't care about that for now so just encode that into the recipe.
- Add Rust plugins to
plugins.mk
- Dynamically add
files_plugins_*_devel
instead offiles_plugins_*
when building for Android or iOS
Fixes #419 (closed)
Edited by Nirbheek Chauhan