Add ovni to OpenMP-V

Allows building OpenMP-V with ovni support, which is neccessary to run
the runtime tests of OpenMP-V in ovni.

Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>
Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Tested-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>