davdroid builds fail for 1.9.2 and 1.9.3
following #969 (closed) (reboot loops due to a LineageOS bug, see #979 (closed)) davdroid mitigated this using build tools 27: https://forums.bitfire.at/topic/1574/davdroid-1-9-release-notes/3
these builds fail in f-droid: https://f-droid.org/wiki/page/at.bitfire.davdroid/lastbuild_189
> Failed to install the following SDK components:
[Android SDK Platform 27]
Please install the missing components using the SDK manager in Android Studio.