[Pixman] Make pixman compatible with big image

[Bill Spitzak]

It looks like making bits->rowstride into a size_t would be a better 
solution than doing this casting?

LE GARREC Vincent wrote:
> Dear,
> 
> I tried to create a very big image (height*stride > 2^31) but it looks 
> like there's some difficulties. I reported it 
> (https://bugs.freedesktop.org/show_bug.cgi?id=69014) but the solution 
> needs to change more than just few lines.
> 
> Does someone could review the patch I made for one file 
> (https://bugs.freedesktop.org/attachment.cgi?id=85448) ? If it's okay, 
> I'll make a patch for all files.
> 
> And after that, I'll make another patch for cairo that have exactly the 
> same problem.
> 
> Regards,
> Vincent LE GARREC
> 
> 
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