media-gfx/openvdb: New package

media-gfx/openvdb: New package

OpenVDB is an Academy Award-winning open-source C++ library
comprising a novel hierarchical data structure and a suite of tools
for the efficient storage and manipulation of sparse volumetric
data discretized on three-dimensional grids. It is developed and
maintained by DreamWorks Animation for use in volumetric
applications typically encountered in feature film production.

Gentoo-Bug: 482664

Signed off by: Jonathan Scruggs (j.scruggs@gmail.com, irc: Dracwyrm)
Signed off by: Adrian Grigo (agrigo2001@yahoo.com.au)
Closes: https://github.com/gentoo/gentoo/pull/2531

Signed-off-by: David Seifert <soap@gentoo.org>