Update bundled version of libmv

- Ensures fix for msvc2012 is applying correct.
- Some code cleanup to match libmv's code style.
- Do not include points which were intersect
  behind the camera to a reconstruction.
- Includes changes needed for keyframe selection.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56719 954f8c5b-7b00-dc11-b283-0030488c597c