Bug#921459: dead upstream - keep out of testing

[Rebecca N. Palmer]

Package: freefem3d
Severity: serious

This package is dead upstream, and it has been suggested [0] that 
because of this, it should not be fixed for buster.

I don't know enough about it to have an opinion on this: I am opening 
this bug as a "don't waste your time fixing it" notice.

If this remains the consensus, please consider removing it from unstable 
as well.

[0] https://lists.debian.org/debian-science/2019/02/msg00015.html