webmdshow: Remove MSVC 2005 and 2008 projects.

- Drop the _2010 suffix from projects that target MSVC 2013
  (aka v120 platform toolset).
- Fix makewebm dependencies (it didn't have any; it needs webmmux and
  vp8encoder).

Change-Id: I4abe701fc876c55bae1d66cee010d674b80a28e6
webmdshow: Update Ogg/Vorbis filter projects

- Note: Toolset remains vs2010 (because we need new libogg and
  libvorbis builds before the toolset can be updated).
- Dropped _2010 suffix from projects (vs2013 makes it perfectly
  clear which toolset is in use).
- Remove MSVC 2008 projects.

Change-Id: I59985c3758e6ee1fef44237d82a0fd0db00a7909