[poppler] Patch: Change Splashbitmap RGB8 to 32bits internal

[Frank Meerkoetter]

Hello,

this patch changes the internal format used by SplashBitmap for mode RGB8
to 32bits. The first three byte are RGB and the last one is a fixed alpha.
This allows the wrappers to use a fast memcopy when copying data out
of Splashbitmaps instead of the getPixel()/setPixel() loop currently
used.

The only wrapper i've touched is the QT3 wrapper because i don't have QT4
or Gnome around.

Regards,
   Frank
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