Blender Git Loki

First attempt to handle openexr/ilmbase 2.0 in install_deps.sh (linux builds).

Only activated for Deb-like distro for now, only tested with testing/amd64. Notes :
* Had to add a hell of patches to ilmbase/openexr/oiio cmake files (some are real, stupid bugs fixing [like files missing in lists or wrong linking order], others are "enhancements" [like being able to compile both static and dyn libs for openexr]).
* Unfortunately, I could not manage to keep oiio static (can't compile osl later, as it does not link all deps of oiio, tiff, jpeg, png, etc.). I�??ll try to fix this later, but for now, you'll have to do as with boost (ldconfig).

I won't say here what I think about not having any (reliable) way to really link a static lib into another one... :/

Will test and enable other distro in following day(s), I do not *expect* much difficulties here.