The previous commit "accidentally" worked around Drew Yao's first integer overflow.

Check some malloc() failures - yes it can happen when the alloc size is variable. Unfortunately, the MP4 code seems pretty hopeless.

(Hint: sizeof(char) is ONE per the definition of sizeof)
(Hint: size is the SECOND parameter of calloc, not the FIRST one)
(Hint: calloc() calls bzero(), waste of time if memory is set anyway)

(unfortunately, it will not be shareable since it contains relocations)

Let's try this again.  Detect older and new versions of ffmpeg and allow for their coexistence within VLC. 

input/input.c: Misformatted if statement fix. Could someone check if that's really the wanted behaviour though. 

Update svn:ignore and remove vlc.win32.nsi, as vlc.win32.nsi.in have been moved to extras/package/win32/.

Update references to ffmpeg header files to match new directory structure.  All ffmpeg headers should now be accessed through: 
* <libpostprocess/postprocess.h>
* <libswscale/swscale.h>
* <libavutil/avutil.h>
* <libavcodec/avcodec.h>
* <libavformat/avformat.h>