fix for building on osx with recent freestyle bugfix.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56997 954f8c5b-7b00-dc11-b283-0030488c597c
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.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56998 954f8c5b-7b00-dc11-b283-0030488c597c