#357 ZMBV fix for paletted modes

[Germán Méndez Bravo]

Hey, there's this discussion in the DOSBox world since
the ZMBV video capture was added to it...

It's about the ZMBV compressed videos using a palette.
Right now the ZMBV DOSBox uses and the one implemented
in libavcodec are different... RGB vs. BGR. I've
looked for files on the internet and I couldn't find
many captured videos in paletted mode, but the ones I
did find work fine with the DOSBox ZMBV, but not with
the one in libavcodec. I'm attaching a patch that
fixes this issue in libavcodec so that it works
consistently with the other files around the Internet.

[Germán Méndez Bravo]

ZMBV fix for paletted modes

[Michael Niedermayer]

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The ZMBV maintainer had the following to say:
"You may test it on samples from MPHQ, all of them except
vbetest_000 and zmbv_*bit are palettized. They work fine
on x86 and PPC under FFmpeg and MPlayer.

I recall that came from FFdshow user and it looks like
_their_ bug not properly supporting PIX_FMT_RGB24."

so iam closing this with "works for me"