[gentoo-science] Singular

[Thomas Kahle]

Hi everybody,

I bumped sci-mathematics/singular to 4.0.2 in the main tree, thereby
importing the first version of the 4.0 branch there.

The 4.0.0 version does not compile anymore for me.  I think it could be
dropped from the science-overlay, but I'm not sure what its relation to
sage-on-gentoo is?

I also had to drop ppc keyword unfortunately since we don't have the new
deps sci-math/flint and sci-math/4ti2 on ppc.  Do we need Singular on ppc?

Cheers,
Thomas