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No functionnality changes.

It fixes a bunch of missing locks and remove unused functions.
It splits input_internal.h

There is no functionnal changes except a few missing events added.

It is not yet functionnal.

Save 2 x 85ko

And generate the .rc with config.status rather than clutering the
Makefile

Saves linking against the C++ runtime,
and allows libtool to generate the symbols table properly.

a lot of code everywhere a filter_t chain is used ("video filter2":
vout core, transcode, chain.c video filter; "sub filter": spu_Init;
"audio filter2": transcode; the other types of filter_t objects are
never chained)

Btw, why aren't "audio filter2" filters used anywhere in the aout core?