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Soo that we avoid plugin cache problem between binary version.

This patch was first thought for Debian but considering it is usefull
for all distros and for VideoLAN own win32 and MacOSX builds, I
think it has its place in the master tree.

They can only be read safely under the Big Structure Lock in
src/misc/objects.c, so it makes no sense for them to be public.

By the way, making i_children volatile wouldn't magically solve
thread-safety issues. The only correct use of volatile is in dealing
with asynchronous changes _within_ the same thread, such as signal
handling.

P.S.: I wish modules were not objects, and I wonder why they are
(they don't don't use threads, nor plugins, nor variables)

This improves readability a lot and prevent us from reinventing the wheel.

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.