[Bf-committers] Update to OpenCollada 1.6.51

[dj azo]

macOS 10.6 libs updated.
(c++11 is not needed on required libs)

> On 7 Jun 2017, at 12.26, Gaia Clary <gaia.clary at machinimatrix.org> wrote:
> 
> Dear Platform maintainers
> 
> 2 days ago Jens Verwiebe has found an issue with building Blender
> on Linux with Clang. It was due to an error in one of the
> Collada include files. The issue has already been fixed in a
> subsequent OpenCollada release.
> 
> Because of this i propose to update to OpenCollada - 1.6.51:
> 
> https://github.com/KhronosGroup/OpenCOLLADA/releases/tag/v1.6.51
-- 
Azo