Provide basic H.264 CG support for windows x86 build



It is a pure version using ffmpeg to provide basic support of CG for windows although no atrac3+ audio in CG.

Tested with following games and CG runs okay with this commit

    Project Diva 2 extend
    Gundam Vs Gundam Next Plus
    Dragon Ball Z Shin Budokai 2

Courtesy of oioitff and his hard work.