make fetchsrclibs plugin work without any Android SDK; add test
Before, fdroidserver required the Android SDK to be present since it required aapt, etc. This is no longer true, and the Android SDK is now only required for signing APKs and maybe fdroid build
. This makes things work without any Android SDK configured or present at all. Then the fdroid fetchsrclibs
plugin works without Android SDK at all. This plugin is used by issuebot and fdroiddata's fdroid build
job.
This also adds a test of fdroid fetchsrclibs
and @uniqx's plugins infrastructure.