VSNASM, x264 and FFVS updates

The following projects have been updated:

FFmpeg upstream has now officially dropped support for Windows XP. This means all official FFmpeg builds will only work on Vista or higher. However I added some local changes to my FFmpeg repo so that it still supports Windows XP. As such all supplied 32bit projects and release binaries provided here still support Windows XP.

Any projects that have a dependency that was updated has also been updated to build with the latest versions of the new libraries as well.