lint: check if CurrentVersion is older than oldest build entry
lint: check if CurrentVersion is older than oldest build entry

This causes F-Droid to never install this app, except for manually via the
Versions list in AppDetails.

f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver