graphics/Coin update

[Pedro Giffuni]

Hi;

Finally Coin3D 4, under a BSD 3 Clause license has been released and I 
have an update for it:

https://people.freebsd.org/~pfg/patches/graphics-coin.diff

Among with it, the new site on github has new version of pivy and 
quarter (a replacement for SoQt). Unfortunately those don't always build 
as before, I am still investigating if they require a swig update or 
what else.

In any case, I though I'd share the link in case someone wants to play 
with it.

Pedro.