avcodec/mpeg4videoenc: Split writing blocks into intra and inter

These are sufficiently different to warrant their own functions;
in particular, the earlier code had two callsites for the actual
"write block" function, one for intra and one for inter, yet
the "write block" function nevertheless performed a check
(that the compiler can't optimize away) for whether the current
MB is intra or not.

Signed-off-by: Andreas Rheinhardt <[email protected]>

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