Drop a few warnings and default definitions from the test suite

Status Job ID Name Coverage
  Git Update
failed #424963
nix
git-update

 
  Tests
skipped #424965
allowed to fail manual
tests-on-llvm-10
skipped #424966
nix
tests-on-llvm-11
skipped #424964
nix
tests-on-llvm-9
 
Name Stage Failure
failed
git-update Git Update There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log