Use ffmpeg for decoding Atrac3+ in sceAtrac. Thanks Maxim.
Things seem more stable after initializing the AVPacket.

More testing needed though.
Use ffmpeg for Atrac3+ decoding during video playback as well.
Rip out the support for the Atrac3+ plugin. It is gone, to never return.
Windows build fixes
One more buildfix
Define __STDC_CONSTANT_MACROS in CMakeLists.txt so Linux x86 will build.
Clean up SimpleAT3Dec, don't allocate new Frame objects all the time
Update to ffmpeg with Maxim's latest patch