[Pixman] Make pixman compatible with big image

[LE GARREC Vincent]

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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