FFmpeg: Bump to version 2.3.2
LINUX: Fix compile error.

Removal of utils/StdString.h in 6c3a7b62 lost an indirect include of
stdio.h which defined FILE for this header.
Merge pull request #5226 from t-nelson/compile_fix

LINUX: Fix compile error.
Merge pull request #5206 from fritsch/ffmpeg-2.3.2

FFmpeg: Bump to version 2.3.2
Rename isDVDImage() to isDiscImage().

Conflicts:
	xbmc/video/windows/GUIWindowVideoBase.cpp
[win32] rename and generalise packaging folders. also simplify NSIS installer to match package folders