Fixing a compilation error and some warning on Debian GNU/Linux 8 jessie/testing with libavcodec.
I am a C and C++ beginner, so this commit MUST be checked, thanks.
Merge branch 'master' of https://github.com/RyDroid/dolphin into fix-compilation-on-debian-8-with-libavcodec

Conflicts:
	Source/Core/VideoCommon/AVIDump.cpp