Add Android/x86 build jobs
The patch add only one manual job that can be started by the developers explicitly. Android/x86 builds are excluded from nigtly and release builds.
The plan is the following:
- Make a release without Android/x86 platform
- If the users report a regression about the missing platform, then we will quickly resurrect the platform.
We think that all uses of Android/x86 are currently because of mistakenly installed APKs, downloaded from our website. All systems, which Play Market reports using these packages, support x86_64, so we guess that installation of x86 was a user mistake/misclick.