This is a vestige of implementing builds from a .fdroid.yml file directly
in the app's source repo. It was never fully complete and seems to not be
used in any apps in fdroiddata. This makes `fdroid build --all` runs much
faster since it does not need to do any git handling for apps that do not
have any new builds to run.
4e8e29794948689281a4e431080e37be9b06e775d330c
common.set_FDroidPopen_env() is used to call git and other tools that
are not part of the Android SDK nor require Java, so the items that
are being set from the config are optional. This lets plugins do
quite a bit without ever setting up a config.
This is used in _fdroiddata_'s `fdroid build` CI job, and _issuebot_.
This uses @uniqx's awesome new 'plugin' feature to create a 'fetchsrclibs`
command. The 'fdroid build' gitlab-ci job uses --on-server, which does not
set up the srclibs. This plugin does the missing setup.
This is moved from _fdroiddata_ where it was _tools/fdroid_fetchsrclibs.py_.
