webmdshow/third_party: Update Xiph libraries.

- Update libogg to v1.3.2
- Update libvorbis to v1.3.4
- Use MSVC 2013 (v120) platform toolset in Ogg and Vorbis filters
  (thus removing the MSVC 2010/v100 dependency).

Change-Id: Ic038e275e6f58734fa5862c00faf26e84a9fbe85