Fix F-droid build

[licaon-kter]

Ref: https://f-droid.org/wiki/index.php?title=ee.ioc.phon.android.speak/lastbuild_1734&oldid=273841

Ref: https://gitlab.com/fdroid/fdroiddata/-/merge_requests/7204

[Kaljurand]

Thanks for building Kõnele for F-Droid!

So far I've avoided placing gradle.properties under version control because it contains definitions that are specific to my environment (passwords etc.). Are you saying that F-Droid expects gradle.properties to be under version control, and contain exactly this line? Are there other definitions that should/could be added, e.g.

org.gradle.jvmargs=-Xmx1536m
org.gradle.parallel=true
android.enableD8=true
...

[licaon-kter]

Not F-Droid, look at the first link... The Google tools or Gradle expect that there. Not sure why you didn't see this locally.

No idea on the others.